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Finding the Fourth Proportional to 12,216.70, 18,301.47 and 7,290.28

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Solution

The fourth proportional to 12,216.70, 18,301.47 and 7,290.28 is: 10,921.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,216.70 : 18,301.47 = 7,290.28 : x
  2. Step 2: Convert to fraction form
    12,216.70/18,301.47 = 7,290.28/x
  3. Step 3: Cross multiply
    12,216.70x = 18,301.47 × 7,290.28
  4. Step 4: Simplify right side
    12,216.70x = 133,422,840.71
  5. Step 5: Solve for x
    x = 133,422,840.71/12,216.70
  6. Step 6: Final answer
    x = 10,921.35

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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.