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Finding the Fourth Proportional to 841.80, 1,161.78 and 814.92

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Solution

The fourth proportional to 841.80, 1,161.78 and 814.92 is: 1,124.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.80 : 1,161.78 = 814.92 : x
  2. Step 2: Convert to fraction form
    841.80/1,161.78 = 814.92/x
  3. Step 3: Cross multiply
    841.80x = 1,161.78 × 814.92
  4. Step 4: Simplify right side
    841.80x = 946,757.76
  5. Step 5: Solve for x
    x = 946,757.76/841.80
  6. Step 6: Final answer
    x = 1,124.68

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1.5x scale

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.