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Finding the Fourth Proportional to 1,471.96, 2,031.48 and 912.80

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Solution

The fourth proportional to 1,471.96, 2,031.48 and 912.80 is: 1,259.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,471.96 : 2,031.48 = 912.80 : x
  2. Step 2: Convert to fraction form
    1,471.96/2,031.48 = 912.80/x
  3. Step 3: Cross multiply
    1,471.96x = 2,031.48 × 912.80
  4. Step 4: Simplify right side
    1,471.96x = 1,854,334.94
  5. Step 5: Solve for x
    x = 1,854,334.94/1,471.96
  6. Step 6: Final answer
    x = 1,259.77

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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.