Home / 428,912.15-643,285.20-144,572.79

Finding the Fourth Proportional to 428,912.15, 643,285.20 and 144,572.79

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Solution

The fourth proportional to 428,912.15, 643,285.20 and 144,572.79 is: 216,831.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,912.15 : 643,285.20 = 144,572.79 : x
  2. Step 2: Convert to fraction form
    428,912.15/643,285.20 = 144,572.79/x
  3. Step 3: Cross multiply
    428,912.15x = 643,285.20 × 144,572.79
  4. Step 4: Simplify right side
    428,912.15x = 93,001,536,129.71
  5. Step 5: Solve for x
    x = 93,001,536,129.71/428,912.15
  6. Step 6: Final answer
    x = 216,831.20

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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.