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Finding the Fourth Proportional to 811.95, 1,120.49 and 517.15

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Solution

The fourth proportional to 811.95, 1,120.49 and 517.15 is: 713.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.95 : 1,120.49 = 517.15 : x
  2. Step 2: Convert to fraction form
    811.95/1,120.49 = 517.15/x
  3. Step 3: Cross multiply
    811.95x = 1,120.49 × 517.15
  4. Step 4: Simplify right side
    811.95x = 579,461.40
  5. Step 5: Solve for x
    x = 579,461.40/811.95
  6. Step 6: Final answer
    x = 713.67

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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.