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Finding the Fourth Proportional to 790.92, 1,091.88 and 613.50

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Solution

The fourth proportional to 790.92, 1,091.88 and 613.50 is: 846.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.92 : 1,091.88 = 613.50 : x
  2. Step 2: Convert to fraction form
    790.92/1,091.88 = 613.50/x
  3. Step 3: Cross multiply
    790.92x = 1,091.88 × 613.50
  4. Step 4: Simplify right side
    790.92x = 669,868.38
  5. Step 5: Solve for x
    x = 669,868.38/790.92
  6. Step 6: Final answer
    x = 846.95

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1.5x scale

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.