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Finding the Fourth Proportional to 862.47, 1,290.65 and 699.75

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Solution

The fourth proportional to 862.47, 1,290.65 and 699.75 is: 1,047.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.47 : 1,290.65 = 699.75 : x
  2. Step 2: Convert to fraction form
    862.47/1,290.65 = 699.75/x
  3. Step 3: Cross multiply
    862.47x = 1,290.65 × 699.75
  4. Step 4: Simplify right side
    862.47x = 903,128.84
  5. Step 5: Solve for x
    x = 903,128.84/862.47
  6. Step 6: Final answer
    x = 1,047.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.