Home / 20,130.72-27,771-15,406.80

Finding the Fourth Proportional to 20,130.72, 27,771 and 15,406.80

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Solution

The fourth proportional to 20,130.72, 27,771 and 15,406.80 is: 21,254.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,130.72 : 27,771 = 15,406.80 : x
  2. Step 2: Convert to fraction form
    20,130.72/27,771 = 15,406.80/x
  3. Step 3: Cross multiply
    20,130.72x = 27,771 × 15,406.80
  4. Step 4: Simplify right side
    20,130.72x = 427,862,242.80
  5. Step 5: Solve for x
    x = 427,862,242.80/20,130.72
  6. Step 6: Final answer
    x = 21,254.19

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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.