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Finding the Fourth Proportional to 1,538.66, 2,123.79 and 875.87

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Solution

The fourth proportional to 1,538.66, 2,123.79 and 875.87 is: 1,208.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,538.66 : 2,123.79 = 875.87 : x
  2. Step 2: Convert to fraction form
    1,538.66/2,123.79 = 875.87/x
  3. Step 3: Cross multiply
    1,538.66x = 2,123.79 × 875.87
  4. Step 4: Simplify right side
    1,538.66x = 1,860,163.95
  5. Step 5: Solve for x
    x = 1,860,163.95/1,538.66
  6. Step 6: Final answer
    x = 1,208.95

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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.