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Finding the Fourth Proportional to 1,079.45, 1,490.13 and 839.64

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Solution

The fourth proportional to 1,079.45, 1,490.13 and 839.64 is: 1,159.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.45 : 1,490.13 = 839.64 : x
  2. Step 2: Convert to fraction form
    1,079.45/1,490.13 = 839.64/x
  3. Step 3: Cross multiply
    1,079.45x = 1,490.13 × 839.64
  4. Step 4: Simplify right side
    1,079.45x = 1,251,161.10
  5. Step 5: Solve for x
    x = 1,251,161.10/1,079.45
  6. Step 6: Final answer
    x = 1,159.07

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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.