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Finding the Fourth Proportional to 1,124.38, 1,686.56 and 864.84

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Solution

The fourth proportional to 1,124.38, 1,686.56 and 864.84 is: 1,297.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.38 : 1,686.56 = 864.84 : x
  2. Step 2: Convert to fraction form
    1,124.38/1,686.56 = 864.84/x
  3. Step 3: Cross multiply
    1,124.38x = 1,686.56 × 864.84
  4. Step 4: Simplify right side
    1,124.38x = 1,458,603.47
  5. Step 5: Solve for x
    x = 1,458,603.47/1,124.38
  6. Step 6: Final answer
    x = 1,297.25

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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.