Home / 20,875.79-28,808.49-11,315.64

Finding the Fourth Proportional to 20,875.79, 28,808.49 and 11,315.64

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Solution

The fourth proportional to 20,875.79, 28,808.49 and 11,315.64 is: 15,615.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,875.79 : 28,808.49 = 11,315.64 : x
  2. Step 2: Convert to fraction form
    20,875.79/28,808.49 = 11,315.64/x
  3. Step 3: Cross multiply
    20,875.79x = 28,808.49 × 11,315.64
  4. Step 4: Simplify right side
    20,875.79x = 325,986,445.21
  5. Step 5: Solve for x
    x = 325,986,445.21/20,875.79
  6. Step 6: Final answer
    x = 15,615.53

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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.