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Finding the Fourth Proportional to 20,602, 28,430.76 and 11,170.56

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Solution

The fourth proportional to 20,602, 28,430.76 and 11,170.56 is: 15,415.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,602 : 28,430.76 = 11,170.56 : x
  2. Step 2: Convert to fraction form
    20,602/28,430.76 = 11,170.56/x
  3. Step 3: Cross multiply
    20,602x = 28,430.76 × 11,170.56
  4. Step 4: Simplify right side
    20,602x = 317,587,510.43
  5. Step 5: Solve for x
    x = 317,587,510.43/20,602
  6. Step 6: Final answer
    x = 15,415.37

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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.