Home / 7,155.48-9,875.16-3,969.78

Finding the Fourth Proportional to 7,155.48, 9,875.16 and 3,969.78

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Solution

The fourth proportional to 7,155.48, 9,875.16 and 3,969.78 is: 5,478.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,155.48 : 9,875.16 = 3,969.78 : x
  2. Step 2: Convert to fraction form
    7,155.48/9,875.16 = 3,969.78/x
  3. Step 3: Cross multiply
    7,155.48x = 9,875.16 × 3,969.78
  4. Step 4: Simplify right side
    7,155.48x = 39,202,212.66
  5. Step 5: Solve for x
    x = 39,202,212.66/7,155.48
  6. Step 6: Final answer
    x = 5,478.63

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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.