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Finding the Fourth Proportional to 18,935.24, 28,400.70 and 7,248.20

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Solution

The fourth proportional to 18,935.24, 28,400.70 and 7,248.20 is: 10,871.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,935.24 : 28,400.70 = 7,248.20 : x
  2. Step 2: Convert to fraction form
    18,935.24/28,400.70 = 7,248.20/x
  3. Step 3: Cross multiply
    18,935.24x = 28,400.70 × 7,248.20
  4. Step 4: Simplify right side
    18,935.24x = 205,853,953.74
  5. Step 5: Solve for x
    x = 205,853,953.74/18,935.24
  6. Step 6: Final answer
    x = 10,871.47

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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.