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Finding the Fourth Proportional to 790.69, 1,091.55 and 496.25

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Solution

The fourth proportional to 790.69, 1,091.55 and 496.25 is: 685.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.69 : 1,091.55 = 496.25 : x
  2. Step 2: Convert to fraction form
    790.69/1,091.55 = 496.25/x
  3. Step 3: Cross multiply
    790.69x = 1,091.55 × 496.25
  4. Step 4: Simplify right side
    790.69x = 541,686.28
  5. Step 5: Solve for x
    x = 541,686.28/790.69
  6. Step 6: Final answer
    x = 685.08

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Double scale
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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.