Home / 21,487.80-29,683.07-20,436.87

Finding the Fourth Proportional to 21,487.80, 29,683.07 and 20,436.87

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Solution

The fourth proportional to 21,487.80, 29,683.07 and 20,436.87 is: 28,231.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,487.80 : 29,683.07 = 20,436.87 : x
  2. Step 2: Convert to fraction form
    21,487.80/29,683.07 = 20,436.87/x
  3. Step 3: Cross multiply
    21,487.80x = 29,683.07 × 20,436.87
  4. Step 4: Simplify right side
    21,487.80x = 606,628,905.93
  5. Step 5: Solve for x
    x = 606,628,905.93/21,487.80
  6. Step 6: Final answer
    x = 28,231.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.