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Finding the Fourth Proportional to 819.01, 1,130.08 and 487.52

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Solution

The fourth proportional to 819.01, 1,130.08 and 487.52 is: 672.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.01 : 1,130.08 = 487.52 : x
  2. Step 2: Convert to fraction form
    819.01/1,130.08 = 487.52/x
  3. Step 3: Cross multiply
    819.01x = 1,130.08 × 487.52
  4. Step 4: Simplify right side
    819.01x = 550,928.51
  5. Step 5: Solve for x
    x = 550,928.51/819.01
  6. Step 6: Final answer
    x = 672.68

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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.