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Finding the Fourth Proportional to 1,686.94, 2,530.91 and 865.79

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Solution

The fourth proportional to 1,686.94, 2,530.91 and 865.79 is: 1,298.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,686.94 : 2,530.91 = 865.79 : x
  2. Step 2: Convert to fraction form
    1,686.94/2,530.91 = 865.79/x
  3. Step 3: Cross multiply
    1,686.94x = 2,530.91 × 865.79
  4. Step 4: Simplify right side
    1,686.94x = 2,191,232.24
  5. Step 5: Solve for x
    x = 2,191,232.24/1,686.94
  6. Step 6: Final answer
    x = 1,298.94

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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.