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Finding the Fourth Proportional to 643,040.80, 887,353.05 and 356,550.28

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Solution

The fourth proportional to 643,040.80, 887,353.05 and 356,550.28 is: 492,015.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,040.80 : 887,353.05 = 356,550.28 : x
  2. Step 2: Convert to fraction form
    643,040.80/887,353.05 = 356,550.28/x
  3. Step 3: Cross multiply
    643,040.80x = 887,353.05 × 356,550.28
  4. Step 4: Simplify right side
    643,040.80x = 316,385,978,436.35
  5. Step 5: Solve for x
    x = 316,385,978,436.35/643,040.80
  6. Step 6: Final answer
    x = 492,015.40

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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.