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Finding the Fourth Proportional to 869.55, 1,305.35 and 687.07

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Solution

The fourth proportional to 869.55, 1,305.35 and 687.07 is: 1,031.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.55 : 1,305.35 = 687.07 : x
  2. Step 2: Convert to fraction form
    869.55/1,305.35 = 687.07/x
  3. Step 3: Cross multiply
    869.55x = 1,305.35 × 687.07
  4. Step 4: Simplify right side
    869.55x = 896,866.82
  5. Step 5: Solve for x
    x = 896,866.82/869.55
  6. Step 6: Final answer
    x = 1,031.41

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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.