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Finding the Fourth Proportional to 765.06, 1,055.93 and 718.17

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Solution

The fourth proportional to 765.06, 1,055.93 and 718.17 is: 991.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.06 : 1,055.93 = 718.17 : x
  2. Step 2: Convert to fraction form
    765.06/1,055.93 = 718.17/x
  3. Step 3: Cross multiply
    765.06x = 1,055.93 × 718.17
  4. Step 4: Simplify right side
    765.06x = 758,333.66
  5. Step 5: Solve for x
    x = 758,333.66/765.06
  6. Step 6: Final answer
    x = 991.21

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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.