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Finding the Fourth Proportional to 981.76, 1,354.50 and 608.61

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Solution

The fourth proportional to 981.76, 1,354.50 and 608.61 is: 839.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.76 : 1,354.50 = 608.61 : x
  2. Step 2: Convert to fraction form
    981.76/1,354.50 = 608.61/x
  3. Step 3: Cross multiply
    981.76x = 1,354.50 × 608.61
  4. Step 4: Simplify right side
    981.76x = 824,354.12
  5. Step 5: Solve for x
    x = 824,354.12/981.76
  6. Step 6: Final answer
    x = 839.67

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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.