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Finding the Fourth Proportional to 430,437.20, 645,655.80 and 427,672.40

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Solution

The fourth proportional to 430,437.20, 645,655.80 and 427,672.40 is: 641,508.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    430,437.20 : 645,655.80 = 427,672.40 : x
  2. Step 2: Convert to fraction form
    430,437.20/645,655.80 = 427,672.40/x
  3. Step 3: Cross multiply
    430,437.20x = 645,655.80 × 427,672.40
  4. Step 4: Simplify right side
    430,437.20x = 276,129,165,559.92
  5. Step 5: Solve for x
    x = 276,129,165,559.92/430,437.20
  6. Step 6: Final answer
    x = 641,508.60

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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.