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Finding the Fourth Proportional to 1,079.69, 1,490.02 and 659.95

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Solution

The fourth proportional to 1,079.69, 1,490.02 and 659.95 is: 910.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.69 : 1,490.02 = 659.95 : x
  2. Step 2: Convert to fraction form
    1,079.69/1,490.02 = 659.95/x
  3. Step 3: Cross multiply
    1,079.69x = 1,490.02 × 659.95
  4. Step 4: Simplify right side
    1,079.69x = 983,338.70
  5. Step 5: Solve for x
    x = 983,338.70/1,079.69
  6. Step 6: Final answer
    x = 910.76

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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.