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Finding the Fourth Proportional to 991.10, 1,486.95 and 717.29

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Solution

The fourth proportional to 991.10, 1,486.95 and 717.29 is: 1,076.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.10 : 1,486.95 = 717.29 : x
  2. Step 2: Convert to fraction form
    991.10/1,486.95 = 717.29/x
  3. Step 3: Cross multiply
    991.10x = 1,486.95 × 717.29
  4. Step 4: Simplify right side
    991.10x = 1,066,566.93
  5. Step 5: Solve for x
    x = 1,066,566.93/991.10
  6. Step 6: Final answer
    x = 1,076.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.