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Finding the Fourth Proportional to 28,477.94, 42,720.98 and 8,758.15

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Solution

The fourth proportional to 28,477.94, 42,720.98 and 8,758.15 is: 13,138.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,477.94 : 42,720.98 = 8,758.15 : x
  2. Step 2: Convert to fraction form
    28,477.94/42,720.98 = 8,758.15/x
  3. Step 3: Cross multiply
    28,477.94x = 42,720.98 × 8,758.15
  4. Step 4: Simplify right side
    28,477.94x = 374,156,600.39
  5. Step 5: Solve for x
    x = 374,156,600.39/28,477.94
  6. Step 6: Final answer
    x = 13,138.47

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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.