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Finding the Fourth Proportional to 931.64, 1,398.68 and 624.86

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Solution

The fourth proportional to 931.64, 1,398.68 and 624.86 is: 938.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.64 : 1,398.68 = 624.86 : x
  2. Step 2: Convert to fraction form
    931.64/1,398.68 = 624.86/x
  3. Step 3: Cross multiply
    931.64x = 1,398.68 × 624.86
  4. Step 4: Simplify right side
    931.64x = 873,981.90
  5. Step 5: Solve for x
    x = 873,981.90/931.64
  6. Step 6: Final answer
    x = 938.11

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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.