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Finding the Fourth Proportional to 1,079.73, 1,489.13 and 665.01

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Solution

The fourth proportional to 1,079.73, 1,489.13 and 665.01 is: 917.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.73 : 1,489.13 = 665.01 : x
  2. Step 2: Convert to fraction form
    1,079.73/1,489.13 = 665.01/x
  3. Step 3: Cross multiply
    1,079.73x = 1,489.13 × 665.01
  4. Step 4: Simplify right side
    1,079.73x = 990,283.02
  5. Step 5: Solve for x
    x = 990,283.02/1,079.73
  6. Step 6: Final answer
    x = 917.16

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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.