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Finding the Fourth Proportional to 931.38, 1,284.98 and 553.18

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Solution

The fourth proportional to 931.38, 1,284.98 and 553.18 is: 763.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.38 : 1,284.98 = 553.18 : x
  2. Step 2: Convert to fraction form
    931.38/1,284.98 = 553.18/x
  3. Step 3: Cross multiply
    931.38x = 1,284.98 × 553.18
  4. Step 4: Simplify right side
    931.38x = 710,825.24
  5. Step 5: Solve for x
    x = 710,825.24/931.38
  6. Step 6: Final answer
    x = 763.20

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.