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Finding the Fourth Proportional to 693.78, 961.98 and 670.65

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Solution

The fourth proportional to 693.78, 961.98 and 670.65 is: 929.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.78 : 961.98 = 670.65 : x
  2. Step 2: Convert to fraction form
    693.78/961.98 = 670.65/x
  3. Step 3: Cross multiply
    693.78x = 961.98 × 670.65
  4. Step 4: Simplify right side
    693.78x = 645,151.89
  5. Step 5: Solve for x
    x = 645,151.89/693.78
  6. Step 6: Final answer
    x = 929.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.