Home / 3,139.02-4,337.56-2,987.20

Finding the Fourth Proportional to 3,139.02, 4,337.56 and 2,987.20

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Solution

The fourth proportional to 3,139.02, 4,337.56 and 2,987.20 is: 4,127.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,139.02 : 4,337.56 = 2,987.20 : x
  2. Step 2: Convert to fraction form
    3,139.02/4,337.56 = 2,987.20/x
  3. Step 3: Cross multiply
    3,139.02x = 4,337.56 × 2,987.20
  4. Step 4: Simplify right side
    3,139.02x = 12,957,159.23
  5. Step 5: Solve for x
    x = 12,957,159.23/3,139.02
  6. Step 6: Final answer
    x = 4,127.77

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Half scale
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Double scale
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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.