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Finding the Fourth Proportional to 145,718.90, 218,535.15 and 56,921.30

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Solution

The fourth proportional to 145,718.90, 218,535.15 and 56,921.30 is: 85,365.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,718.90 : 218,535.15 = 56,921.30 : x
  2. Step 2: Convert to fraction form
    145,718.90/218,535.15 = 56,921.30/x
  3. Step 3: Cross multiply
    145,718.90x = 218,535.15 × 56,921.30
  4. Step 4: Simplify right side
    145,718.90x = 12,439,304,833.70
  5. Step 5: Solve for x
    x = 12,439,304,833.70/145,718.90
  6. Step 6: Final answer
    x = 85,365.08

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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.