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Finding the Fourth Proportional to 815.47, 1,125.36 and 483.91

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Solution

The fourth proportional to 815.47, 1,125.36 and 483.91 is: 667.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.47 : 1,125.36 = 483.91 : x
  2. Step 2: Convert to fraction form
    815.47/1,125.36 = 483.91/x
  3. Step 3: Cross multiply
    815.47x = 1,125.36 × 483.91
  4. Step 4: Simplify right side
    815.47x = 544,570.14
  5. Step 5: Solve for x
    x = 544,570.14/815.47
  6. Step 6: Final answer
    x = 667.80

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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.