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Finding the Fourth Proportional to 933.13, 1,397.87 and 715.65

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Solution

The fourth proportional to 933.13, 1,397.87 and 715.65 is: 1,072.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.13 : 1,397.87 = 715.65 : x
  2. Step 2: Convert to fraction form
    933.13/1,397.87 = 715.65/x
  3. Step 3: Cross multiply
    933.13x = 1,397.87 × 715.65
  4. Step 4: Simplify right side
    933.13x = 1,000,385.67
  5. Step 5: Solve for x
    x = 1,000,385.67/933.13
  6. Step 6: Final answer
    x = 1,072.08

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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.