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Finding the Fourth Proportional to 1,039.05, 1,552.86 and 979.11

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Solution

The fourth proportional to 1,039.05, 1,552.86 and 979.11 is: 1,463.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.05 : 1,552.86 = 979.11 : x
  2. Step 2: Convert to fraction form
    1,039.05/1,552.86 = 979.11/x
  3. Step 3: Cross multiply
    1,039.05x = 1,552.86 × 979.11
  4. Step 4: Simplify right side
    1,039.05x = 1,520,420.75
  5. Step 5: Solve for x
    x = 1,520,420.75/1,039.05
  6. Step 6: Final answer
    x = 1,463.28

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.