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Finding the Fourth Proportional to 28,659.40, 42,980.78 and 9,938.68

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Solution

The fourth proportional to 28,659.40, 42,980.78 and 9,938.68 is: 14,905.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,659.40 : 42,980.78 = 9,938.68 : x
  2. Step 2: Convert to fraction form
    28,659.40/42,980.78 = 9,938.68/x
  3. Step 3: Cross multiply
    28,659.40x = 42,980.78 × 9,938.68
  4. Step 4: Simplify right side
    28,659.40x = 427,172,218.57
  5. Step 5: Solve for x
    x = 427,172,218.57/28,659.40
  6. Step 6: Final answer
    x = 14,905.13

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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.