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Finding the Fourth Proportional to 457,624.40, 686,436.60 and 426,520.40

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Solution

The fourth proportional to 457,624.40, 686,436.60 and 426,520.40 is: 639,780.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    457,624.40 : 686,436.60 = 426,520.40 : x
  2. Step 2: Convert to fraction form
    457,624.40/686,436.60 = 426,520.40/x
  3. Step 3: Cross multiply
    457,624.40x = 686,436.60 × 426,520.40
  4. Step 4: Simplify right side
    457,624.40x = 292,779,213,206.64
  5. Step 5: Solve for x
    x = 292,779,213,206.64/457,624.40
  6. Step 6: Final answer
    x = 639,780.60

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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.