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Finding the Fourth Proportional to 718.76, 991.51 and 543.80

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Solution

The fourth proportional to 718.76, 991.51 and 543.80 is: 750.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.76 : 991.51 = 543.80 : x
  2. Step 2: Convert to fraction form
    718.76/991.51 = 543.80/x
  3. Step 3: Cross multiply
    718.76x = 991.51 × 543.80
  4. Step 4: Simplify right side
    718.76x = 539,176.82
  5. Step 5: Solve for x
    x = 539,176.82/718.76
  6. Step 6: Final answer
    x = 750.15

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.