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Finding the Fourth Proportional to 642,472.28, 886,598.53 and 355,989.86

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Solution

The fourth proportional to 642,472.28, 886,598.53 and 355,989.86 is: 491,258.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,472.28 : 886,598.53 = 355,989.86 : x
  2. Step 2: Convert to fraction form
    642,472.28/886,598.53 = 355,989.86/x
  3. Step 3: Cross multiply
    642,472.28x = 886,598.53 × 355,989.86
  4. Step 4: Simplify right side
    642,472.28x = 315,620,084,790.96
  5. Step 5: Solve for x
    x = 315,620,084,790.96/642,472.28
  6. Step 6: Final answer
    x = 491,258.68

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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.