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Finding the Fourth Proportional to 643,356.80, 887,938.86 and 356,969.15

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Solution

The fourth proportional to 643,356.80, 887,938.86 and 356,969.15 is: 492,676.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,356.80 : 887,938.86 = 356,969.15 : x
  2. Step 2: Convert to fraction form
    643,356.80/887,938.86 = 356,969.15/x
  3. Step 3: Cross multiply
    643,356.80x = 887,938.86 × 356,969.15
  4. Step 4: Simplify right side
    643,356.80x = 316,966,780,106.17
  5. Step 5: Solve for x
    x = 316,966,780,106.17/643,356.80
  6. Step 6: Final answer
    x = 492,676.51

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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.