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Finding the Fourth Proportional to 811.19, 1,119.75 and 615.17

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Solution

The fourth proportional to 811.19, 1,119.75 and 615.17 is: 849.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.19 : 1,119.75 = 615.17 : x
  2. Step 2: Convert to fraction form
    811.19/1,119.75 = 615.17/x
  3. Step 3: Cross multiply
    811.19x = 1,119.75 × 615.17
  4. Step 4: Simplify right side
    811.19x = 688,836.61
  5. Step 5: Solve for x
    x = 688,836.61/811.19
  6. Step 6: Final answer
    x = 849.17

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Double scale
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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.