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Finding the Fourth Proportional to 988.20, 1,478.05 and 961.67

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Solution

The fourth proportional to 988.20, 1,478.05 and 961.67 is: 1,438.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.20 : 1,478.05 = 961.67 : x
  2. Step 2: Convert to fraction form
    988.20/1,478.05 = 961.67/x
  3. Step 3: Cross multiply
    988.20x = 1,478.05 × 961.67
  4. Step 4: Simplify right side
    988.20x = 1,421,397.63
  5. Step 5: Solve for x
    x = 1,421,397.63/988.20
  6. Step 6: Final answer
    x = 1,438.37

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.