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Finding the Fourth Proportional to 875.46, 1,207.25 and 639.45

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Solution

The fourth proportional to 875.46, 1,207.25 and 639.45 is: 881.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.46 : 1,207.25 = 639.45 : x
  2. Step 2: Convert to fraction form
    875.46/1,207.25 = 639.45/x
  3. Step 3: Cross multiply
    875.46x = 1,207.25 × 639.45
  4. Step 4: Simplify right side
    875.46x = 771,966.78
  5. Step 5: Solve for x
    x = 771,966.78/875.46
  6. Step 6: Final answer
    x = 881.78

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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.