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Finding the Fourth Proportional to 790.61, 1,091.07 and 613.76

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Solution

The fourth proportional to 790.61, 1,091.07 and 613.76 is: 847.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.61 : 1,091.07 = 613.76 : x
  2. Step 2: Convert to fraction form
    790.61/1,091.07 = 613.76/x
  3. Step 3: Cross multiply
    790.61x = 1,091.07 × 613.76
  4. Step 4: Simplify right side
    790.61x = 669,649.67
  5. Step 5: Solve for x
    x = 669,649.67/790.61
  6. Step 6: Final answer
    x = 847.01

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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.