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Finding the Fourth Proportional to 438,143.80, 656,502.90 and 396,153.40

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Solution

The fourth proportional to 438,143.80, 656,502.90 and 396,153.40 is: 593,585.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,143.80 : 656,502.90 = 396,153.40 : x
  2. Step 2: Convert to fraction form
    438,143.80/656,502.90 = 396,153.40/x
  3. Step 3: Cross multiply
    438,143.80x = 656,502.90 × 396,153.40
  4. Step 4: Simplify right side
    438,143.80x = 260,075,855,944.86
  5. Step 5: Solve for x
    x = 260,075,855,944.86/438,143.80
  6. Step 6: Final answer
    x = 593,585.61

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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.