Home / 1,127.12-1,690.68-386.72

Finding the Fourth Proportional to 1,127.12, 1,690.68 and 386.72

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Solution

The fourth proportional to 1,127.12, 1,690.68 and 386.72 is: 580.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.12 : 1,690.68 = 386.72 : x
  2. Step 2: Convert to fraction form
    1,127.12/1,690.68 = 386.72/x
  3. Step 3: Cross multiply
    1,127.12x = 1,690.68 × 386.72
  4. Step 4: Simplify right side
    1,127.12x = 653,819.77
  5. Step 5: Solve for x
    x = 653,819.77/1,127.12
  6. Step 6: Final answer
    x = 580.08

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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.