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Finding the Fourth Proportional to 1,321,987.78, 1,824,343.08 and 718,375.78

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Solution

The fourth proportional to 1,321,987.78, 1,824,343.08 and 718,375.78 is: 991,358.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321,987.78 : 1,824,343.08 = 718,375.78 : x
  2. Step 2: Convert to fraction form
    1,321,987.78/1,824,343.08 = 718,375.78/x
  3. Step 3: Cross multiply
    1,321,987.78x = 1,824,343.08 × 718,375.78
  4. Step 4: Simplify right side
    1,321,987.78x = 1,310,563,883,082.60
  5. Step 5: Solve for x
    x = 1,310,563,883,082.60/1,321,987.78
  6. Step 6: Final answer
    x = 991,358.55

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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.