Home / 20,688.18-28,549.53-11,256.72

Finding the Fourth Proportional to 20,688.18, 28,549.53 and 11,256.72

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Solution

The fourth proportional to 20,688.18, 28,549.53 and 11,256.72 is: 15,534.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,688.18 : 28,549.53 = 11,256.72 : x
  2. Step 2: Convert to fraction form
    20,688.18/28,549.53 = 11,256.72/x
  3. Step 3: Cross multiply
    20,688.18x = 28,549.53 × 11,256.72
  4. Step 4: Simplify right side
    20,688.18x = 321,374,065.34
  5. Step 5: Solve for x
    x = 321,374,065.34/20,688.18
  6. Step 6: Final answer
    x = 15,534.19

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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.