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Finding the Fourth Proportional to 991.25, 1,486.88 and 307.25

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Solution

The fourth proportional to 991.25, 1,486.88 and 307.25 is: 460.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.25 : 1,486.88 = 307.25 : x
  2. Step 2: Convert to fraction form
    991.25/1,486.88 = 307.25/x
  3. Step 3: Cross multiply
    991.25x = 1,486.88 × 307.25
  4. Step 4: Simplify right side
    991.25x = 456,842.34
  5. Step 5: Solve for x
    x = 456,842.34/991.25
  6. Step 6: Final answer
    x = 460.88

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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.