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Finding the Fourth Proportional to 991.01, 1,486.40 and 250.61

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Solution

The fourth proportional to 991.01, 1,486.40 and 250.61 is: 375.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.01 : 1,486.40 = 250.61 : x
  2. Step 2: Convert to fraction form
    991.01/1,486.40 = 250.61/x
  3. Step 3: Cross multiply
    991.01x = 1,486.40 × 250.61
  4. Step 4: Simplify right side
    991.01x = 372,509.17
  5. Step 5: Solve for x
    x = 372,509.17/991.01
  6. Step 6: Final answer
    x = 375.89

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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.