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Finding the Fourth Proportional to 28,012.50, 38,659.68 and 15,439.68

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Solution

The fourth proportional to 28,012.50, 38,659.68 and 15,439.68 is: 21,308.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,012.50 : 38,659.68 = 15,439.68 : x
  2. Step 2: Convert to fraction form
    28,012.50/38,659.68 = 15,439.68/x
  3. Step 3: Cross multiply
    28,012.50x = 38,659.68 × 15,439.68
  4. Step 4: Simplify right side
    28,012.50x = 596,893,088.10
  5. Step 5: Solve for x
    x = 596,893,088.10/28,012.50
  6. Step 6: Final answer
    x = 21,308.10

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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.