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Finding the Fourth Proportional to 21,409.98, 32,112.13 and 9,720.51

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Solution

The fourth proportional to 21,409.98, 32,112.13 and 9,720.51 is: 14,579.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,409.98 : 32,112.13 = 9,720.51 : x
  2. Step 2: Convert to fraction form
    21,409.98/32,112.13 = 9,720.51/x
  3. Step 3: Cross multiply
    21,409.98x = 32,112.13 × 9,720.51
  4. Step 4: Simplify right side
    21,409.98x = 312,146,280.79
  5. Step 5: Solve for x
    x = 312,146,280.79/21,409.98
  6. Step 6: Final answer
    x = 14,579.48

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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.