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Finding the Fourth Proportional to 777.53, 1,072.87 and 498.02

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Solution

The fourth proportional to 777.53, 1,072.87 and 498.02 is: 687.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.53 : 1,072.87 = 498.02 : x
  2. Step 2: Convert to fraction form
    777.53/1,072.87 = 498.02/x
  3. Step 3: Cross multiply
    777.53x = 1,072.87 × 498.02
  4. Step 4: Simplify right side
    777.53x = 534,305.35
  5. Step 5: Solve for x
    x = 534,305.35/777.53
  6. Step 6: Final answer
    x = 687.18

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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.