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Finding the Fourth Proportional to 10,918.80, 16,378.20 and 7,808.40

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Solution

The fourth proportional to 10,918.80, 16,378.20 and 7,808.40 is: 11,712.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,918.80 : 16,378.20 = 7,808.40 : x
  2. Step 2: Convert to fraction form
    10,918.80/16,378.20 = 7,808.40/x
  3. Step 3: Cross multiply
    10,918.80x = 16,378.20 × 7,808.40
  4. Step 4: Simplify right side
    10,918.80x = 127,887,536.88
  5. Step 5: Solve for x
    x = 127,887,536.88/10,918.80
  6. Step 6: Final answer
    x = 11,712.60

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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.