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Finding the Fourth Proportional to 1,039.86, 1,431.95 and 929.30

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Solution

The fourth proportional to 1,039.86, 1,431.95 and 929.30 is: 1,279.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.86 : 1,431.95 = 929.30 : x
  2. Step 2: Convert to fraction form
    1,039.86/1,431.95 = 929.30/x
  3. Step 3: Cross multiply
    1,039.86x = 1,431.95 × 929.30
  4. Step 4: Simplify right side
    1,039.86x = 1,330,699.33
  5. Step 5: Solve for x
    x = 1,330,699.33/1,039.86
  6. Step 6: Final answer
    x = 1,279.69

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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.