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Finding the Fourth Proportional to 28,640.64, 42,960.92 and 15,518.64

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Solution

The fourth proportional to 28,640.64, 42,960.92 and 15,518.64 is: 23,277.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,640.64 : 42,960.92 = 15,518.64 : x
  2. Step 2: Convert to fraction form
    28,640.64/42,960.92 = 15,518.64/x
  3. Step 3: Cross multiply
    28,640.64x = 42,960.92 × 15,518.64
  4. Step 4: Simplify right side
    28,640.64x = 666,695,051.55
  5. Step 5: Solve for x
    x = 666,695,051.55/28,640.64
  6. Step 6: Final answer
    x = 23,277.94

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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.