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Finding the Fourth Proportional to 5,155.86, 7,115 and 2,917.68

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Solution

The fourth proportional to 5,155.86, 7,115 and 2,917.68 is: 4,026.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,155.86 : 7,115 = 2,917.68 : x
  2. Step 2: Convert to fraction form
    5,155.86/7,115 = 2,917.68/x
  3. Step 3: Cross multiply
    5,155.86x = 7,115 × 2,917.68
  4. Step 4: Simplify right side
    5,155.86x = 20,759,293.20
  5. Step 5: Solve for x
    x = 20,759,293.20/5,155.86
  6. Step 6: Final answer
    x = 4,026.35

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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.