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Finding the Fourth Proportional to 7,878.48, 10,867.48 and 4,689.64

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Solution

The fourth proportional to 7,878.48, 10,867.48 and 4,689.64 is: 6,468.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,878.48 : 10,867.48 = 4,689.64 : x
  2. Step 2: Convert to fraction form
    7,878.48/10,867.48 = 4,689.64/x
  3. Step 3: Cross multiply
    7,878.48x = 10,867.48 × 4,689.64
  4. Step 4: Simplify right side
    7,878.48x = 50,964,568.91
  5. Step 5: Solve for x
    x = 50,964,568.91/7,878.48
  6. Step 6: Final answer
    x = 6,468.83

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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.