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Finding the Fourth Proportional to 765.71, 1,056.79 and 718.80

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Solution

The fourth proportional to 765.71, 1,056.79 and 718.80 is: 992.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.71 : 1,056.79 = 718.80 : x
  2. Step 2: Convert to fraction form
    765.71/1,056.79 = 718.80/x
  3. Step 3: Cross multiply
    765.71x = 1,056.79 × 718.80
  4. Step 4: Simplify right side
    765.71x = 759,620.65
  5. Step 5: Solve for x
    x = 759,620.65/765.71
  6. Step 6: Final answer
    x = 992.05

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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.