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Finding the Fourth Proportional to 715,661.80, 987,639.24 and 393,396.40

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Solution

The fourth proportional to 715,661.80, 987,639.24 and 393,396.40 is: 542,901.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,661.80 : 987,639.24 = 393,396.40 : x
  2. Step 2: Convert to fraction form
    715,661.80/987,639.24 = 393,396.40/x
  3. Step 3: Cross multiply
    715,661.80x = 987,639.24 × 393,396.40
  4. Step 4: Simplify right side
    715,661.80x = 388,533,721,514.74
  5. Step 5: Solve for x
    x = 388,533,721,514.74/715,661.80
  6. Step 6: Final answer
    x = 542,901.30

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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.