Home / 1,125.27-1,686.75-431.76

Finding the Fourth Proportional to 1,125.27, 1,686.75 and 431.76

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Solution

The fourth proportional to 1,125.27, 1,686.75 and 431.76 is: 647.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.27 : 1,686.75 = 431.76 : x
  2. Step 2: Convert to fraction form
    1,125.27/1,686.75 = 431.76/x
  3. Step 3: Cross multiply
    1,125.27x = 1,686.75 × 431.76
  4. Step 4: Simplify right side
    1,125.27x = 728,271.18
  5. Step 5: Solve for x
    x = 728,271.18/1,125.27
  6. Step 6: Final answer
    x = 647.20

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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.