Home / 1,125.02-1,686.45-394.40

Finding the Fourth Proportional to 1,125.02, 1,686.45 and 394.40

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Solution

The fourth proportional to 1,125.02, 1,686.45 and 394.40 is: 591.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.02 : 1,686.45 = 394.40 : x
  2. Step 2: Convert to fraction form
    1,125.02/1,686.45 = 394.40/x
  3. Step 3: Cross multiply
    1,125.02x = 1,686.45 × 394.40
  4. Step 4: Simplify right side
    1,125.02x = 665,135.88
  5. Step 5: Solve for x
    x = 665,135.88/1,125.02
  6. Step 6: Final answer
    x = 591.22

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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.