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Finding the Fourth Proportional to 11,875.20, 17,812.80 and 8,918.40

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Solution

The fourth proportional to 11,875.20, 17,812.80 and 8,918.40 is: 13,377.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,875.20 : 17,812.80 = 8,918.40 : x
  2. Step 2: Convert to fraction form
    11,875.20/17,812.80 = 8,918.40/x
  3. Step 3: Cross multiply
    11,875.20x = 17,812.80 × 8,918.40
  4. Step 4: Simplify right side
    11,875.20x = 158,861,675.52
  5. Step 5: Solve for x
    x = 158,861,675.52/11,875.20
  6. Step 6: Final answer
    x = 13,377.60

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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.