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Finding the Fourth Proportional to 991.88, 1,488.30 and 444.44

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Solution

The fourth proportional to 991.88, 1,488.30 and 444.44 is: 666.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.88 : 1,488.30 = 444.44 : x
  2. Step 2: Convert to fraction form
    991.88/1,488.30 = 444.44/x
  3. Step 3: Cross multiply
    991.88x = 1,488.30 × 444.44
  4. Step 4: Simplify right side
    991.88x = 661,460.05
  5. Step 5: Solve for x
    x = 661,460.05/991.88
  6. Step 6: Final answer
    x = 666.88

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1.5x scale

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.