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Finding the Fourth Proportional to 825.76, 1,139.92 and 589.76

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Solution

The fourth proportional to 825.76, 1,139.92 and 589.76 is: 814.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.76 : 1,139.92 = 589.76 : x
  2. Step 2: Convert to fraction form
    825.76/1,139.92 = 589.76/x
  3. Step 3: Cross multiply
    825.76x = 1,139.92 × 589.76
  4. Step 4: Simplify right side
    825.76x = 672,279.22
  5. Step 5: Solve for x
    x = 672,279.22/825.76
  6. Step 6: Final answer
    x = 814.13

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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.