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Finding the Fourth Proportional to 21,339.78, 32,009.67 and 7,488.78

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Solution

The fourth proportional to 21,339.78, 32,009.67 and 7,488.78 is: 11,233.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,339.78 : 32,009.67 = 7,488.78 : x
  2. Step 2: Convert to fraction form
    21,339.78/32,009.67 = 7,488.78/x
  3. Step 3: Cross multiply
    21,339.78x = 32,009.67 × 7,488.78
  4. Step 4: Simplify right side
    21,339.78x = 239,713,376.50
  5. Step 5: Solve for x
    x = 239,713,376.50/21,339.78
  6. Step 6: Final answer
    x = 11,233.17

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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.