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Finding the Fourth Proportional to 715,515.15, 987,411.64 and 393,218.32

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Solution

The fourth proportional to 715,515.15, 987,411.64 and 393,218.32 is: 542,641.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,515.15 : 987,411.64 = 393,218.32 : x
  2. Step 2: Convert to fraction form
    715,515.15/987,411.64 = 393,218.32/x
  3. Step 3: Cross multiply
    715,515.15x = 987,411.64 × 393,218.32
  4. Step 4: Simplify right side
    715,515.15x = 388,268,345,246.20
  5. Step 5: Solve for x
    x = 388,268,345,246.20/715,515.15
  6. Step 6: Final answer
    x = 542,641.69

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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.