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Finding the Fourth Proportional to 18,960.78, 28,428.99 and 7,875.12

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Solution

The fourth proportional to 18,960.78, 28,428.99 and 7,875.12 is: 11,807.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,960.78 : 28,428.99 = 7,875.12 : x
  2. Step 2: Convert to fraction form
    18,960.78/28,428.99 = 7,875.12/x
  3. Step 3: Cross multiply
    18,960.78x = 28,428.99 × 7,875.12
  4. Step 4: Simplify right side
    18,960.78x = 223,881,707.73
  5. Step 5: Solve for x
    x = 223,881,707.73/18,960.78
  6. Step 6: Final answer
    x = 11,807.62

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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.