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Finding the Fourth Proportional to 28,915.60, 43,362.60 and 20,124.40

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Solution

The fourth proportional to 28,915.60, 43,362.60 and 20,124.40 is: 30,179.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,915.60 : 43,362.60 = 20,124.40 : x
  2. Step 2: Convert to fraction form
    28,915.60/43,362.60 = 20,124.40/x
  3. Step 3: Cross multiply
    28,915.60x = 43,362.60 × 20,124.40
  4. Step 4: Simplify right side
    28,915.60x = 872,646,307.44
  5. Step 5: Solve for x
    x = 872,646,307.44/28,915.60
  6. Step 6: Final answer
    x = 30,179.08

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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.