Home / 1,118.31-1,543.35-621.12

Finding the Fourth Proportional to 1,118.31, 1,543.35 and 621.12

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Solution

The fourth proportional to 1,118.31, 1,543.35 and 621.12 is: 857.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.31 : 1,543.35 = 621.12 : x
  2. Step 2: Convert to fraction form
    1,118.31/1,543.35 = 621.12/x
  3. Step 3: Cross multiply
    1,118.31x = 1,543.35 × 621.12
  4. Step 4: Simplify right side
    1,118.31x = 958,604.99
  5. Step 5: Solve for x
    x = 958,604.99/1,118.31
  6. Step 6: Final answer
    x = 857.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.