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Finding the Fourth Proportional to 1,472.42, 2,031.76 and 842.90

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Solution

The fourth proportional to 1,472.42, 2,031.76 and 842.90 is: 1,163.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,472.42 : 2,031.76 = 842.90 : x
  2. Step 2: Convert to fraction form
    1,472.42/2,031.76 = 842.90/x
  3. Step 3: Cross multiply
    1,472.42x = 2,031.76 × 842.90
  4. Step 4: Simplify right side
    1,472.42x = 1,712,570.50
  5. Step 5: Solve for x
    x = 1,712,570.50/1,472.42
  6. Step 6: Final answer
    x = 1,163.10

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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.