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Finding the Fourth Proportional to 715,732.85, 987,714.53 and 393,463.70

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Solution

The fourth proportional to 715,732.85, 987,714.53 and 393,463.70 is: 542,981.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,732.85 : 987,714.53 = 393,463.70 : x
  2. Step 2: Convert to fraction form
    715,732.85/987,714.53 = 393,463.70/x
  3. Step 3: Cross multiply
    715,732.85x = 987,714.53 × 393,463.70
  4. Step 4: Simplify right side
    715,732.85x = 388,629,813,185.76
  5. Step 5: Solve for x
    x = 388,629,813,185.76/715,732.85
  6. Step 6: Final answer
    x = 542,981.67

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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.