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Finding the Fourth Proportional to 28,653.88, 42,981.12 and 8,663.55

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Solution

The fourth proportional to 28,653.88, 42,981.12 and 8,663.55 is: 12,995.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,653.88 : 42,981.12 = 8,663.55 : x
  2. Step 2: Convert to fraction form
    28,653.88/42,981.12 = 8,663.55/x
  3. Step 3: Cross multiply
    28,653.88x = 42,981.12 × 8,663.55
  4. Step 4: Simplify right side
    28,653.88x = 372,369,082.18
  5. Step 5: Solve for x
    x = 372,369,082.18/28,653.88
  6. Step 6: Final answer
    x = 12,995.42

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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.