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Finding the Fourth Proportional to 892.80, 1,231.68 and 581.76

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Solution

The fourth proportional to 892.80, 1,231.68 and 581.76 is: 802.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.80 : 1,231.68 = 581.76 : x
  2. Step 2: Convert to fraction form
    892.80/1,231.68 = 581.76/x
  3. Step 3: Cross multiply
    892.80x = 1,231.68 × 581.76
  4. Step 4: Simplify right side
    892.80x = 716,542.16
  5. Step 5: Solve for x
    x = 716,542.16/892.80
  6. Step 6: Final answer
    x = 802.58

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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.