Home / 9,986.20-13,780.65-5,509.78

Finding the Fourth Proportional to 9,986.20, 13,780.65 and 5,509.78

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Solution

The fourth proportional to 9,986.20, 13,780.65 and 5,509.78 is: 7,603.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,986.20 : 13,780.65 = 5,509.78 : x
  2. Step 2: Convert to fraction form
    9,986.20/13,780.65 = 5,509.78/x
  3. Step 3: Cross multiply
    9,986.20x = 13,780.65 × 5,509.78
  4. Step 4: Simplify right side
    9,986.20x = 75,928,349.76
  5. Step 5: Solve for x
    x = 75,928,349.76/9,986.20
  6. Step 6: Final answer
    x = 7,603.33

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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.