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Finding the Fourth Proportional to 790.60, 1,088.76 and 642.10

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Solution

The fourth proportional to 790.60, 1,088.76 and 642.10 is: 884.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.60 : 1,088.76 = 642.10 : x
  2. Step 2: Convert to fraction form
    790.60/1,088.76 = 642.10/x
  3. Step 3: Cross multiply
    790.60x = 1,088.76 × 642.10
  4. Step 4: Simplify right side
    790.60x = 699,092.80
  5. Step 5: Solve for x
    x = 699,092.80/790.60
  6. Step 6: Final answer
    x = 884.26

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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.