Home / 1,125.02-1,687.55-431.66

Finding the Fourth Proportional to 1,125.02, 1,687.55 and 431.66

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Solution

The fourth proportional to 1,125.02, 1,687.55 and 431.66 is: 647.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.02 : 1,687.55 = 431.66 : x
  2. Step 2: Convert to fraction form
    1,125.02/1,687.55 = 431.66/x
  3. Step 3: Cross multiply
    1,125.02x = 1,687.55 × 431.66
  4. Step 4: Simplify right side
    1,125.02x = 728,437.24
  5. Step 5: Solve for x
    x = 728,437.24/1,125.02
  6. Step 6: Final answer
    x = 647.49

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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.