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Finding the Fourth Proportional to 862.04, 1,189.78 and 512.76

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Solution

The fourth proportional to 862.04, 1,189.78 and 512.76 is: 707.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.04 : 1,189.78 = 512.76 : x
  2. Step 2: Convert to fraction form
    862.04/1,189.78 = 512.76/x
  3. Step 3: Cross multiply
    862.04x = 1,189.78 × 512.76
  4. Step 4: Simplify right side
    862.04x = 610,071.59
  5. Step 5: Solve for x
    x = 610,071.59/862.04
  6. Step 6: Final answer
    x = 707.71

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Double scale
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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.