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Finding the Fourth Proportional to 561,937.20, 842,905.80 and 393,647.55

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Solution

The fourth proportional to 561,937.20, 842,905.80 and 393,647.55 is: 590,471.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    561,937.20 : 842,905.80 = 393,647.55 : x
  2. Step 2: Convert to fraction form
    561,937.20/842,905.80 = 393,647.55/x
  3. Step 3: Cross multiply
    561,937.20x = 842,905.80 × 393,647.55
  4. Step 4: Simplify right side
    561,937.20x = 331,807,803,050.79
  5. Step 5: Solve for x
    x = 331,807,803,050.79/561,937.20
  6. Step 6: Final answer
    x = 590,471.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.