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Finding the Fourth Proportional to 715,297.55, 987,108.67 and 393,014.75

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Solution

The fourth proportional to 715,297.55, 987,108.67 and 393,014.75 is: 542,359.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,297.55 : 987,108.67 = 393,014.75 : x
  2. Step 2: Convert to fraction form
    715,297.55/987,108.67 = 393,014.75/x
  3. Step 3: Cross multiply
    715,297.55x = 987,108.67 × 393,014.75
  4. Step 4: Simplify right side
    715,297.55x = 387,948,267,162.88
  5. Step 5: Solve for x
    x = 387,948,267,162.88/715,297.55
  6. Step 6: Final answer
    x = 542,359.28

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Double scale
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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.