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Finding the Fourth Proportional to 765.12, 1,055.12 and 502.64

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Solution

The fourth proportional to 765.12, 1,055.12 and 502.64 is: 693.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.12 : 1,055.12 = 502.64 : x
  2. Step 2: Convert to fraction form
    765.12/1,055.12 = 502.64/x
  3. Step 3: Cross multiply
    765.12x = 1,055.12 × 502.64
  4. Step 4: Simplify right side
    765.12x = 530,345.52
  5. Step 5: Solve for x
    x = 530,345.52/765.12
  6. Step 6: Final answer
    x = 693.15

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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.