Home / 75,780.80-104,328.24-72,040.40

Finding the Fourth Proportional to 75,780.80, 104,328.24 and 72,040.40

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Solution

The fourth proportional to 75,780.80, 104,328.24 and 72,040.40 is: 99,178.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    75,780.80 : 104,328.24 = 72,040.40 : x
  2. Step 2: Convert to fraction form
    75,780.80/104,328.24 = 72,040.40/x
  3. Step 3: Cross multiply
    75,780.80x = 104,328.24 × 72,040.40
  4. Step 4: Simplify right side
    75,780.80x = 7,515,848,140.90
  5. Step 5: Solve for x
    x = 7,515,848,140.90/75,780.80
  6. Step 6: Final answer
    x = 99,178.79

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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.