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Finding the Fourth Proportional to 715,499.10, 987,368.67 and 393,209.10

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Solution

The fourth proportional to 715,499.10, 987,368.67 and 393,209.10 is: 542,617.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,499.10 : 987,368.67 = 393,209.10 : x
  2. Step 2: Convert to fraction form
    715,499.10/987,368.67 = 393,209.10/x
  3. Step 3: Cross multiply
    715,499.10x = 987,368.67 × 393,209.10
  4. Step 4: Simplify right side
    715,499.10x = 388,242,346,098.90
  5. Step 5: Solve for x
    x = 388,242,346,098.90/715,499.10
  6. Step 6: Final answer
    x = 542,617.52

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1.5x scale

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.