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Finding the Fourth Proportional to 428,411.70, 642,617.55 and 251,118.90

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Solution

The fourth proportional to 428,411.70, 642,617.55 and 251,118.90 is: 376,678.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,411.70 : 642,617.55 = 251,118.90 : x
  2. Step 2: Convert to fraction form
    428,411.70/642,617.55 = 251,118.90/x
  3. Step 3: Cross multiply
    428,411.70x = 642,617.55 × 251,118.90
  4. Step 4: Simplify right side
    428,411.70x = 161,373,412,276.70
  5. Step 5: Solve for x
    x = 161,373,412,276.70/428,411.70
  6. Step 6: Final answer
    x = 376,678.35

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Similar ratio
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1.5x scale

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.