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Finding the Fourth Proportional to 643,756.10, 888,334.17 and 371,699.78

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Solution

The fourth proportional to 643,756.10, 888,334.17 and 371,699.78 is: 512,917.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,756.10 : 888,334.17 = 371,699.78 : x
  2. Step 2: Convert to fraction form
    643,756.10/888,334.17 = 371,699.78/x
  3. Step 3: Cross multiply
    643,756.10x = 888,334.17 × 371,699.78
  4. Step 4: Simplify right side
    643,756.10x = 330,193,615,555.48
  5. Step 5: Solve for x
    x = 330,193,615,555.48/643,756.10
  6. Step 6: Final answer
    x = 512,917.26

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1.5x scale

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.