Home / 1,128.75-1,560.92-1,077.18

Finding the Fourth Proportional to 1,128.75, 1,560.92 and 1,077.18

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Solution

The fourth proportional to 1,128.75, 1,560.92 and 1,077.18 is: 1,489.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.75 : 1,560.92 = 1,077.18 : x
  2. Step 2: Convert to fraction form
    1,128.75/1,560.92 = 1,077.18/x
  3. Step 3: Cross multiply
    1,128.75x = 1,560.92 × 1,077.18
  4. Step 4: Simplify right side
    1,128.75x = 1,681,386.42
  5. Step 5: Solve for x
    x = 1,681,386.42/1,128.75
  6. Step 6: Final answer
    x = 1,489.60

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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.