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Finding the Fourth Proportional to 1,188.23, 1,639.62 and 690.76

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Solution

The fourth proportional to 1,188.23, 1,639.62 and 690.76 is: 953.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.23 : 1,639.62 = 690.76 : x
  2. Step 2: Convert to fraction form
    1,188.23/1,639.62 = 690.76/x
  3. Step 3: Cross multiply
    1,188.23x = 1,639.62 × 690.76
  4. Step 4: Simplify right side
    1,188.23x = 1,132,583.91
  5. Step 5: Solve for x
    x = 1,132,583.91/1,188.23
  6. Step 6: Final answer
    x = 953.17

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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.