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Finding the Fourth Proportional to 908, 1,253.60 and 711.04

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Solution

The fourth proportional to 908, 1,253.60 and 711.04 is: 981.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    908 : 1,253.60 = 711.04 : x
  2. Step 2: Convert to fraction form
    908/1,253.60 = 711.04/x
  3. Step 3: Cross multiply
    908x = 1,253.60 × 711.04
  4. Step 4: Simplify right side
    908x = 891,359.74
  5. Step 5: Solve for x
    x = 891,359.74/908
  6. Step 6: Final answer
    x = 981.67

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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.