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Finding the Fourth Proportional to 438,327.40, 657,491.10 and 420,612.70

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Solution

The fourth proportional to 438,327.40, 657,491.10 and 420,612.70 is: 630,919.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,327.40 : 657,491.10 = 420,612.70 : x
  2. Step 2: Convert to fraction form
    438,327.40/657,491.10 = 420,612.70/x
  3. Step 3: Cross multiply
    438,327.40x = 657,491.10 × 420,612.70
  4. Step 4: Simplify right side
    438,327.40x = 276,549,106,796.97
  5. Step 5: Solve for x
    x = 276,549,106,796.97/438,327.40
  6. Step 6: Final answer
    x = 630,919.05

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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.