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Finding the Fourth Proportional to 803.99, 1,109.11 and 472.20

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Solution

The fourth proportional to 803.99, 1,109.11 and 472.20 is: 651.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.99 : 1,109.11 = 472.20 : x
  2. Step 2: Convert to fraction form
    803.99/1,109.11 = 472.20/x
  3. Step 3: Cross multiply
    803.99x = 1,109.11 × 472.20
  4. Step 4: Simplify right side
    803.99x = 523,719.38
  5. Step 5: Solve for x
    x = 523,719.38/803.99
  6. Step 6: Final answer
    x = 651.40

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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.