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Finding the Fourth Proportional to 777.08, 1,071.72 and 497.24

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Solution

The fourth proportional to 777.08, 1,071.72 and 497.24 is: 685.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.08 : 1,071.72 = 497.24 : x
  2. Step 2: Convert to fraction form
    777.08/1,071.72 = 497.24/x
  3. Step 3: Cross multiply
    777.08x = 1,071.72 × 497.24
  4. Step 4: Simplify right side
    777.08x = 532,902.05
  5. Step 5: Solve for x
    x = 532,902.05/777.08
  6. Step 6: Final answer
    x = 685.78

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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.