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Finding the Fourth Proportional to 779.20, 1,168.80 and 535.66

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Solution

The fourth proportional to 779.20, 1,168.80 and 535.66 is: 803.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.20 : 1,168.80 = 535.66 : x
  2. Step 2: Convert to fraction form
    779.20/1,168.80 = 535.66/x
  3. Step 3: Cross multiply
    779.20x = 1,168.80 × 535.66
  4. Step 4: Simplify right side
    779.20x = 626,079.41
  5. Step 5: Solve for x
    x = 626,079.41/779.20
  6. Step 6: Final answer
    x = 803.49

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.