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Finding the Fourth Proportional to 458,474.40, 687,128.40 and 221,306.40

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Solution

The fourth proportional to 458,474.40, 687,128.40 and 221,306.40 is: 331,678.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,474.40 : 687,128.40 = 221,306.40 : x
  2. Step 2: Convert to fraction form
    458,474.40/687,128.40 = 221,306.40/x
  3. Step 3: Cross multiply
    458,474.40x = 687,128.40 × 221,306.40
  4. Step 4: Simplify right side
    458,474.40x = 152,065,912,541.76
  5. Step 5: Solve for x
    x = 152,065,912,541.76/458,474.40
  6. Step 6: Final answer
    x = 331,678.09

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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.