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Finding the Fourth Proportional to 451,642.32, 622,721.52 and 390,278.88

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Solution

The fourth proportional to 451,642.32, 622,721.52 and 390,278.88 is: 538,114.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    451,642.32 : 622,721.52 = 390,278.88 : x
  2. Step 2: Convert to fraction form
    451,642.32/622,721.52 = 390,278.88/x
  3. Step 3: Cross multiply
    451,642.32x = 622,721.52 × 390,278.88
  4. Step 4: Simplify right side
    451,642.32x = 243,035,057,377.50
  5. Step 5: Solve for x
    x = 243,035,057,377.50/451,642.32
  6. Step 6: Final answer
    x = 538,114.00

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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.