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Finding the Fourth Proportional to 718.12, 991.02 and 442.12

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Solution

The fourth proportional to 718.12, 991.02 and 442.12 is: 610.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.12 : 991.02 = 442.12 : x
  2. Step 2: Convert to fraction form
    718.12/991.02 = 442.12/x
  3. Step 3: Cross multiply
    718.12x = 991.02 × 442.12
  4. Step 4: Simplify right side
    718.12x = 438,149.76
  5. Step 5: Solve for x
    x = 438,149.76/718.12
  6. Step 6: Final answer
    x = 610.13

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1.5x scale

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.