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Finding the Fourth Proportional to 12,955.60, 19,423.80 and 8,785.20

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Solution

The fourth proportional to 12,955.60, 19,423.80 and 8,785.20 is: 13,171.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,955.60 : 19,423.80 = 8,785.20 : x
  2. Step 2: Convert to fraction form
    12,955.60/19,423.80 = 8,785.20/x
  3. Step 3: Cross multiply
    12,955.60x = 19,423.80 × 8,785.20
  4. Step 4: Simplify right side
    12,955.60x = 170,641,967.76
  5. Step 5: Solve for x
    x = 170,641,967.76/12,955.60
  6. Step 6: Final answer
    x = 13,171.29

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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.