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Finding the Fourth Proportional to 877.16, 1,207.86 and 691.40

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Solution

The fourth proportional to 877.16, 1,207.86 and 691.40 is: 952.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.16 : 1,207.86 = 691.40 : x
  2. Step 2: Convert to fraction form
    877.16/1,207.86 = 691.40/x
  3. Step 3: Cross multiply
    877.16x = 1,207.86 × 691.40
  4. Step 4: Simplify right side
    877.16x = 835,114.40
  5. Step 5: Solve for x
    x = 835,114.40/877.16
  6. Step 6: Final answer
    x = 952.07

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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.