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Finding the Fourth Proportional to 1,079.32, 1,489.95 and 830.55

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Solution

The fourth proportional to 1,079.32, 1,489.95 and 830.55 is: 1,146.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.32 : 1,489.95 = 830.55 : x
  2. Step 2: Convert to fraction form
    1,079.32/1,489.95 = 830.55/x
  3. Step 3: Cross multiply
    1,079.32x = 1,489.95 × 830.55
  4. Step 4: Simplify right side
    1,079.32x = 1,237,477.97
  5. Step 5: Solve for x
    x = 1,237,477.97/1,079.32
  6. Step 6: Final answer
    x = 1,146.53

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1.5x scale

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.