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Finding the Fourth Proportional to 825.78, 1,139.52 and 471.72

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Solution

The fourth proportional to 825.78, 1,139.52 and 471.72 is: 650.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.78 : 1,139.52 = 471.72 : x
  2. Step 2: Convert to fraction form
    825.78/1,139.52 = 471.72/x
  3. Step 3: Cross multiply
    825.78x = 1,139.52 × 471.72
  4. Step 4: Simplify right side
    825.78x = 537,534.37
  5. Step 5: Solve for x
    x = 537,534.37/825.78
  6. Step 6: Final answer
    x = 650.94

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Double scale
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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.