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Finding the Fourth Proportional to 977.55, 1,348.88 and 557.79

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Solution

The fourth proportional to 977.55, 1,348.88 and 557.79 is: 769.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.55 : 1,348.88 = 557.79 : x
  2. Step 2: Convert to fraction form
    977.55/1,348.88 = 557.79/x
  3. Step 3: Cross multiply
    977.55x = 1,348.88 × 557.79
  4. Step 4: Simplify right side
    977.55x = 752,388.99
  5. Step 5: Solve for x
    x = 752,388.99/977.55
  6. Step 6: Final answer
    x = 769.67

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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.