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Finding the Fourth Proportional to 2,666.47, 3,999.93 and 718.78

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Solution

The fourth proportional to 2,666.47, 3,999.93 and 718.78 is: 1,078.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,666.47 : 3,999.93 = 718.78 : x
  2. Step 2: Convert to fraction form
    2,666.47/3,999.93 = 718.78/x
  3. Step 3: Cross multiply
    2,666.47x = 3,999.93 × 718.78
  4. Step 4: Simplify right side
    2,666.47x = 2,875,069.69
  5. Step 5: Solve for x
    x = 2,875,069.69/2,666.47
  6. Step 6: Final answer
    x = 1,078.23

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.