Home / 1,387.11-2,080.60-945.20

Finding the Fourth Proportional to 1,387.11, 2,080.60 and 945.20

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Solution

The fourth proportional to 1,387.11, 2,080.60 and 945.20 is: 1,417.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.11 : 2,080.60 = 945.20 : x
  2. Step 2: Convert to fraction form
    1,387.11/2,080.60 = 945.20/x
  3. Step 3: Cross multiply
    1,387.11x = 2,080.60 × 945.20
  4. Step 4: Simplify right side
    1,387.11x = 1,966,587.37
  5. Step 5: Solve for x
    x = 1,966,587.37/1,387.11
  6. Step 6: Final answer
    x = 1,417.76

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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.