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Finding the Fourth Proportional to 1,138.35, 1,569.67 and 718.21

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Solution

The fourth proportional to 1,138.35, 1,569.67 and 718.21 is: 990.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.35 : 1,569.67 = 718.21 : x
  2. Step 2: Convert to fraction form
    1,138.35/1,569.67 = 718.21/x
  3. Step 3: Cross multiply
    1,138.35x = 1,569.67 × 718.21
  4. Step 4: Simplify right side
    1,138.35x = 1,127,352.69
  5. Step 5: Solve for x
    x = 1,127,352.69/1,138.35
  6. Step 6: Final answer
    x = 990.34

Related Problems

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Half scale
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.