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Finding the Fourth Proportional to 875.18, 1,207.82 and 648.29

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Solution

The fourth proportional to 875.18, 1,207.82 and 648.29 is: 894.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.18 : 1,207.82 = 648.29 : x
  2. Step 2: Convert to fraction form
    875.18/1,207.82 = 648.29/x
  3. Step 3: Cross multiply
    875.18x = 1,207.82 × 648.29
  4. Step 4: Simplify right side
    875.18x = 783,022.27
  5. Step 5: Solve for x
    x = 783,022.27/875.18
  6. Step 6: Final answer
    x = 894.70

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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.