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Finding the Fourth Proportional to 715,518.03, 987,438.56 and 393,239.55

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Solution

The fourth proportional to 715,518.03, 987,438.56 and 393,239.55 is: 542,683.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,518.03 : 987,438.56 = 393,239.55 : x
  2. Step 2: Convert to fraction form
    715,518.03/987,438.56 = 393,239.55/x
  3. Step 3: Cross multiply
    715,518.03x = 987,438.56 × 393,239.55
  4. Step 4: Simplify right side
    715,518.03x = 388,299,893,020.85
  5. Step 5: Solve for x
    x = 388,299,893,020.85/715,518.03
  6. Step 6: Final answer
    x = 542,683.59

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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.