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Finding the Fourth Proportional to 715,590.25, 987,520.71 and 393,307.85

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Solution

The fourth proportional to 715,590.25, 987,520.71 and 393,307.85 is: 542,768.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,590.25 : 987,520.71 = 393,307.85 : x
  2. Step 2: Convert to fraction form
    715,590.25/987,520.71 = 393,307.85/x
  3. Step 3: Cross multiply
    715,590.25x = 987,520.71 × 393,307.85
  4. Step 4: Simplify right side
    715,590.25x = 388,399,651,224.28
  5. Step 5: Solve for x
    x = 388,399,651,224.28/715,590.25
  6. Step 6: Final answer
    x = 542,768.23

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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.