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Finding the Fourth Proportional to 28,055.76, 42,078.78 and 9,336.12

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Solution

The fourth proportional to 28,055.76, 42,078.78 and 9,336.12 is: 14,002.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,055.76 : 42,078.78 = 9,336.12 : x
  2. Step 2: Convert to fraction form
    28,055.76/42,078.78 = 9,336.12/x
  3. Step 3: Cross multiply
    28,055.76x = 42,078.78 × 9,336.12
  4. Step 4: Simplify right side
    28,055.76x = 392,852,539.53
  5. Step 5: Solve for x
    x = 392,852,539.53/28,055.76
  6. Step 6: Final answer
    x = 14,002.56

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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.