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Finding the Fourth Proportional to 1,145.96, 1,718.94 and 689

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Solution

The fourth proportional to 1,145.96, 1,718.94 and 689 is: 1,033.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.96 : 1,718.94 = 689 : x
  2. Step 2: Convert to fraction form
    1,145.96/1,718.94 = 689/x
  3. Step 3: Cross multiply
    1,145.96x = 1,718.94 × 689
  4. Step 4: Simplify right side
    1,145.96x = 1,184,349.66
  5. Step 5: Solve for x
    x = 1,184,349.66/1,145.96
  6. Step 6: Final answer
    x = 1,033.50

Related Problems

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.