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Finding the Fourth Proportional to 28,399.49, 42,618.20 and 9,931.49

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Solution

The fourth proportional to 28,399.49, 42,618.20 and 9,931.49 is: 14,903.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,399.49 : 42,618.20 = 9,931.49 : x
  2. Step 2: Convert to fraction form
    28,399.49/42,618.20 = 9,931.49/x
  3. Step 3: Cross multiply
    28,399.49x = 42,618.20 × 9,931.49
  4. Step 4: Simplify right side
    28,399.49x = 423,262,177.46
  5. Step 5: Solve for x
    x = 423,262,177.46/28,399.49
  6. Step 6: Final answer
    x = 14,903.87

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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.