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Finding the Fourth Proportional to 824.65, 1,139.51 and 615.67

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Solution

The fourth proportional to 824.65, 1,139.51 and 615.67 is: 850.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.65 : 1,139.51 = 615.67 : x
  2. Step 2: Convert to fraction form
    824.65/1,139.51 = 615.67/x
  3. Step 3: Cross multiply
    824.65x = 1,139.51 × 615.67
  4. Step 4: Simplify right side
    824.65x = 701,562.12
  5. Step 5: Solve for x
    x = 701,562.12/824.65
  6. Step 6: Final answer
    x = 850.74

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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.