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Finding the Fourth Proportional to 30,503.52, 42,099.90 and 20,935.55

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Solution

The fourth proportional to 30,503.52, 42,099.90 and 20,935.55 is: 28,894.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,503.52 : 42,099.90 = 20,935.55 : x
  2. Step 2: Convert to fraction form
    30,503.52/42,099.90 = 20,935.55/x
  3. Step 3: Cross multiply
    30,503.52x = 42,099.90 × 20,935.55
  4. Step 4: Simplify right side
    30,503.52x = 881,384,497.16
  5. Step 5: Solve for x
    x = 881,384,497.16/30,503.52
  6. Step 6: Final answer
    x = 28,894.51

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.