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Finding the Fourth Proportional to 790.80, 1,091.16 and 680.10

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Solution

The fourth proportional to 790.80, 1,091.16 and 680.10 is: 938.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.80 : 1,091.16 = 680.10 : x
  2. Step 2: Convert to fraction form
    790.80/1,091.16 = 680.10/x
  3. Step 3: Cross multiply
    790.80x = 1,091.16 × 680.10
  4. Step 4: Simplify right side
    790.80x = 742,097.92
  5. Step 5: Solve for x
    x = 742,097.92/790.80
  6. Step 6: Final answer
    x = 938.41

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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.