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Finding the Fourth Proportional to 18,851.76, 28,289.76 and 10,089.12

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Solution

The fourth proportional to 18,851.76, 28,289.76 and 10,089.12 is: 15,140.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,851.76 : 28,289.76 = 10,089.12 : x
  2. Step 2: Convert to fraction form
    18,851.76/28,289.76 = 10,089.12/x
  3. Step 3: Cross multiply
    18,851.76x = 28,289.76 × 10,089.12
  4. Step 4: Simplify right side
    18,851.76x = 285,418,783.41
  5. Step 5: Solve for x
    x = 285,418,783.41/18,851.76
  6. Step 6: Final answer
    x = 15,140.17

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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.