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Finding the Fourth Proportional to 811.48, 1,119.72 and 462.12

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Solution

The fourth proportional to 811.48, 1,119.72 and 462.12 is: 637.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.48 : 1,119.72 = 462.12 : x
  2. Step 2: Convert to fraction form
    811.48/1,119.72 = 462.12/x
  3. Step 3: Cross multiply
    811.48x = 1,119.72 × 462.12
  4. Step 4: Simplify right side
    811.48x = 517,445.01
  5. Step 5: Solve for x
    x = 517,445.01/811.48
  6. Step 6: Final answer
    x = 637.66

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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.