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Finding the Fourth Proportional to 7,155.54, 9,875.24 and 3,969.86

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Solution

The fourth proportional to 7,155.54, 9,875.24 and 3,969.86 is: 5,478.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,155.54 : 9,875.24 = 3,969.86 : x
  2. Step 2: Convert to fraction form
    7,155.54/9,875.24 = 3,969.86/x
  3. Step 3: Cross multiply
    7,155.54x = 9,875.24 × 3,969.86
  4. Step 4: Simplify right side
    7,155.54x = 39,203,325.11
  5. Step 5: Solve for x
    x = 39,203,325.11/7,155.54
  6. Step 6: Final answer
    x = 5,478.74

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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.