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Finding the Fourth Proportional to 1,539.03, 2,123.53 and 979.30

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Solution

The fourth proportional to 1,539.03, 2,123.53 and 979.30 is: 1,351.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,539.03 : 2,123.53 = 979.30 : x
  2. Step 2: Convert to fraction form
    1,539.03/2,123.53 = 979.30/x
  3. Step 3: Cross multiply
    1,539.03x = 2,123.53 × 979.30
  4. Step 4: Simplify right side
    1,539.03x = 2,079,565.17
  5. Step 5: Solve for x
    x = 2,079,565.17/1,539.03
  6. Step 6: Final answer
    x = 1,351.22

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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.