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Finding the Fourth Proportional to 18,927.20, 28,401.60 and 7,248.80

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Solution

The fourth proportional to 18,927.20, 28,401.60 and 7,248.80 is: 10,877.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,927.20 : 28,401.60 = 7,248.80 : x
  2. Step 2: Convert to fraction form
    18,927.20/28,401.60 = 7,248.80/x
  3. Step 3: Cross multiply
    18,927.20x = 28,401.60 × 7,248.80
  4. Step 4: Simplify right side
    18,927.20x = 205,877,518.08
  5. Step 5: Solve for x
    x = 205,877,518.08/18,927.20
  6. Step 6: Final answer
    x = 10,877.34

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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.