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Finding the Fourth Proportional to 643,719.64, 888,127.60 and 371,751.64

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Solution

The fourth proportional to 643,719.64, 888,127.60 and 371,751.64 is: 512,898.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,719.64 : 888,127.60 = 371,751.64 : x
  2. Step 2: Convert to fraction form
    643,719.64/888,127.60 = 371,751.64/x
  3. Step 3: Cross multiply
    643,719.64x = 888,127.60 × 371,751.64
  4. Step 4: Simplify right side
    643,719.64x = 330,162,891,829.26
  5. Step 5: Solve for x
    x = 330,162,891,829.26/643,719.64
  6. Step 6: Final answer
    x = 512,898.58

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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.