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Finding the Fourth Proportional to 609,083.20, 913,624.80 and 420,126.40

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Solution

The fourth proportional to 609,083.20, 913,624.80 and 420,126.40 is: 630,189.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    609,083.20 : 913,624.80 = 420,126.40 : x
  2. Step 2: Convert to fraction form
    609,083.20/913,624.80 = 420,126.40/x
  3. Step 3: Cross multiply
    609,083.20x = 913,624.80 × 420,126.40
  4. Step 4: Simplify right side
    609,083.20x = 383,837,898,174.72
  5. Step 5: Solve for x
    x = 383,837,898,174.72/609,083.20
  6. Step 6: Final answer
    x = 630,189.60

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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.