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Finding the Fourth Proportional to 700.76, 1,049.70 and 411.50

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Solution

The fourth proportional to 700.76, 1,049.70 and 411.50 is: 616.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    700.76 : 1,049.70 = 411.50 : x
  2. Step 2: Convert to fraction form
    700.76/1,049.70 = 411.50/x
  3. Step 3: Cross multiply
    700.76x = 1,049.70 × 411.50
  4. Step 4: Simplify right side
    700.76x = 431,951.55
  5. Step 5: Solve for x
    x = 431,951.55/700.76
  6. Step 6: Final answer
    x = 616.40

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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.