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Finding the Fourth Proportional to 819.41, 1,130.80 and 487.77

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Solution

The fourth proportional to 819.41, 1,130.80 and 487.77 is: 673.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.41 : 1,130.80 = 487.77 : x
  2. Step 2: Convert to fraction form
    819.41/1,130.80 = 487.77/x
  3. Step 3: Cross multiply
    819.41x = 1,130.80 × 487.77
  4. Step 4: Simplify right side
    819.41x = 551,569.10
  5. Step 5: Solve for x
    x = 551,569.10/819.41
  6. Step 6: Final answer
    x = 673.13

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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.