Home / 3,121.72-4,685.02-1,177.72

Finding the Fourth Proportional to 3,121.72, 4,685.02 and 1,177.72

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Solution

The fourth proportional to 3,121.72, 4,685.02 and 1,177.72 is: 1,767.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.72 : 4,685.02 = 1,177.72 : x
  2. Step 2: Convert to fraction form
    3,121.72/4,685.02 = 1,177.72/x
  3. Step 3: Cross multiply
    3,121.72x = 4,685.02 × 1,177.72
  4. Step 4: Simplify right side
    3,121.72x = 5,517,641.75
  5. Step 5: Solve for x
    x = 5,517,641.75/3,121.72
  6. Step 6: Final answer
    x = 1,767.50

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Half scale
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Double scale
Find fourth proportional to 3,122.72, 4,686.52 and 1,178.72
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.