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Finding the Fourth Proportional to 1,079.90, 1,489.82 and 706.76

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Solution

The fourth proportional to 1,079.90, 1,489.82 and 706.76 is: 975.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.90 : 1,489.82 = 706.76 : x
  2. Step 2: Convert to fraction form
    1,079.90/1,489.82 = 706.76/x
  3. Step 3: Cross multiply
    1,079.90x = 1,489.82 × 706.76
  4. Step 4: Simplify right side
    1,079.90x = 1,052,945.18
  5. Step 5: Solve for x
    x = 1,052,945.18/1,079.90
  6. Step 6: Final answer
    x = 975.04

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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.