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Finding the Fourth Proportional to 811.83, 1,120.05 and 497.24

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Solution

The fourth proportional to 811.83, 1,120.05 and 497.24 is: 686.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.83 : 1,120.05 = 497.24 : x
  2. Step 2: Convert to fraction form
    811.83/1,120.05 = 497.24/x
  3. Step 3: Cross multiply
    811.83x = 1,120.05 × 497.24
  4. Step 4: Simplify right side
    811.83x = 556,933.66
  5. Step 5: Solve for x
    x = 556,933.66/811.83
  6. Step 6: Final answer
    x = 686.02

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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.