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Finding the Fourth Proportional to 12,616.60, 18,924.90 and 9,117.40

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Solution

The fourth proportional to 12,616.60, 18,924.90 and 9,117.40 is: 13,676.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,616.60 : 18,924.90 = 9,117.40 : x
  2. Step 2: Convert to fraction form
    12,616.60/18,924.90 = 9,117.40/x
  3. Step 3: Cross multiply
    12,616.60x = 18,924.90 × 9,117.40
  4. Step 4: Simplify right side
    12,616.60x = 172,545,883.26
  5. Step 5: Solve for x
    x = 172,545,883.26/12,616.60
  6. Step 6: Final answer
    x = 13,676.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.