Home / 28,258.60-42,412.20-12,487.90

Finding the Fourth Proportional to 28,258.60, 42,412.20 and 12,487.90

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Solution

The fourth proportional to 28,258.60, 42,412.20 and 12,487.90 is: 18,742.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,258.60 : 42,412.20 = 12,487.90 : x
  2. Step 2: Convert to fraction form
    28,258.60/42,412.20 = 12,487.90/x
  3. Step 3: Cross multiply
    28,258.60x = 42,412.20 × 12,487.90
  4. Step 4: Simplify right side
    28,258.60x = 529,639,312.38
  5. Step 5: Solve for x
    x = 529,639,312.38/28,258.60
  6. Step 6: Final answer
    x = 18,742.59

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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.