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Finding the Fourth Proportional to 420,435.96, 580,186.98 and 239,134.20

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Solution

The fourth proportional to 420,435.96, 580,186.98 and 239,134.20 is: 329,996.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,435.96 : 580,186.98 = 239,134.20 : x
  2. Step 2: Convert to fraction form
    420,435.96/580,186.98 = 239,134.20/x
  3. Step 3: Cross multiply
    420,435.96x = 580,186.98 × 239,134.20
  4. Step 4: Simplify right side
    420,435.96x = 138,742,549,312.72
  5. Step 5: Solve for x
    x = 138,742,549,312.72/420,435.96
  6. Step 6: Final answer
    x = 329,996.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.