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Finding the Fourth Proportional to 438,420.60, 657,630.90 and 251,278.20

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Solution

The fourth proportional to 438,420.60, 657,630.90 and 251,278.20 is: 376,917.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,420.60 : 657,630.90 = 251,278.20 : x
  2. Step 2: Convert to fraction form
    438,420.60/657,630.90 = 251,278.20/x
  3. Step 3: Cross multiply
    438,420.60x = 657,630.90 × 251,278.20
  4. Step 4: Simplify right side
    438,420.60x = 165,248,308,816.38
  5. Step 5: Solve for x
    x = 165,248,308,816.38/438,420.60
  6. Step 6: Final answer
    x = 376,917.30

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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.