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Finding the Fourth Proportional to 1,539.18, 2,123.54 and 866.88

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Solution

The fourth proportional to 1,539.18, 2,123.54 and 866.88 is: 1,195.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,539.18 : 2,123.54 = 866.88 : x
  2. Step 2: Convert to fraction form
    1,539.18/2,123.54 = 866.88/x
  3. Step 3: Cross multiply
    1,539.18x = 2,123.54 × 866.88
  4. Step 4: Simplify right side
    1,539.18x = 1,840,842.06
  5. Step 5: Solve for x
    x = 1,840,842.06/1,539.18
  6. Step 6: Final answer
    x = 1,195.99

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1.5x scale

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.