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Finding the Fourth Proportional to 869.13, 1,302.35 and 686.07

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Solution

The fourth proportional to 869.13, 1,302.35 and 686.07 is: 1,028.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.13 : 1,302.35 = 686.07 : x
  2. Step 2: Convert to fraction form
    869.13/1,302.35 = 686.07/x
  3. Step 3: Cross multiply
    869.13x = 1,302.35 × 686.07
  4. Step 4: Simplify right side
    869.13x = 893,499.83
  5. Step 5: Solve for x
    x = 893,499.83/869.13
  6. Step 6: Final answer
    x = 1,028.04

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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.