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Finding the Fourth Proportional to 8,918.12, 12,278.85 and 7,855.22

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Solution

The fourth proportional to 8,918.12, 12,278.85 and 7,855.22 is: 10,815.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,918.12 : 12,278.85 = 7,855.22 : x
  2. Step 2: Convert to fraction form
    8,918.12/12,278.85 = 7,855.22/x
  3. Step 3: Cross multiply
    8,918.12x = 12,278.85 × 7,855.22
  4. Step 4: Simplify right side
    8,918.12x = 96,453,068.10
  5. Step 5: Solve for x
    x = 96,453,068.10/8,918.12
  6. Step 6: Final answer
    x = 10,815.40

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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.