Home / 21,148.79-31,661.51-18,329.09

Finding the Fourth Proportional to 21,148.79, 31,661.51 and 18,329.09

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Solution

The fourth proportional to 21,148.79, 31,661.51 and 18,329.09 is: 27,440.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,148.79 : 31,661.51 = 18,329.09 : x
  2. Step 2: Convert to fraction form
    21,148.79/31,661.51 = 18,329.09/x
  3. Step 3: Cross multiply
    21,148.79x = 31,661.51 × 18,329.09
  4. Step 4: Simplify right side
    21,148.79x = 580,326,416.37
  5. Step 5: Solve for x
    x = 580,326,416.37/21,148.79
  6. Step 6: Final answer
    x = 27,440.18

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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.