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Finding the Fourth Proportional to 718.25, 991.55 and 675.05

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Solution

The fourth proportional to 718.25, 991.55 and 675.05 is: 931.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.25 : 991.55 = 675.05 : x
  2. Step 2: Convert to fraction form
    718.25/991.55 = 675.05/x
  3. Step 3: Cross multiply
    718.25x = 991.55 × 675.05
  4. Step 4: Simplify right side
    718.25x = 669,345.83
  5. Step 5: Solve for x
    x = 669,345.83/718.25
  6. Step 6: Final answer
    x = 931.91

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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.