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Finding the Fourth Proportional to 784.22, 1,081.21 and 560.05

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Solution

The fourth proportional to 784.22, 1,081.21 and 560.05 is: 772.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.22 : 1,081.21 = 560.05 : x
  2. Step 2: Convert to fraction form
    784.22/1,081.21 = 560.05/x
  3. Step 3: Cross multiply
    784.22x = 1,081.21 × 560.05
  4. Step 4: Simplify right side
    784.22x = 605,531.66
  5. Step 5: Solve for x
    x = 605,531.66/784.22
  6. Step 6: Final answer
    x = 772.15

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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.