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Finding the Fourth Proportional to 520,079.10, 780,061.05 and 146,139.90

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Solution

The fourth proportional to 520,079.10, 780,061.05 and 146,139.90 is: 219,193.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,079.10 : 780,061.05 = 146,139.90 : x
  2. Step 2: Convert to fraction form
    520,079.10/780,061.05 = 146,139.90/x
  3. Step 3: Cross multiply
    520,079.10x = 780,061.05 × 146,139.90
  4. Step 4: Simplify right side
    520,079.10x = 113,998,043,840.90
  5. Step 5: Solve for x
    x = 113,998,043,840.90/520,079.10
  6. Step 6: Final answer
    x = 219,193.66

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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.