Home / 1,121.40-1,680.30-572.76

Finding the Fourth Proportional to 1,121.40, 1,680.30 and 572.76

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Solution

The fourth proportional to 1,121.40, 1,680.30 and 572.76 is: 858.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.40 : 1,680.30 = 572.76 : x
  2. Step 2: Convert to fraction form
    1,121.40/1,680.30 = 572.76/x
  3. Step 3: Cross multiply
    1,121.40x = 1,680.30 × 572.76
  4. Step 4: Simplify right side
    1,121.40x = 962,408.63
  5. Step 5: Solve for x
    x = 962,408.63/1,121.40
  6. Step 6: Final answer
    x = 858.22

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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.