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Finding the Fourth Proportional to 15,015.40, 20,721.84 and 9,970.93

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Solution

The fourth proportional to 15,015.40, 20,721.84 and 9,970.93 is: 13,760.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,015.40 : 20,721.84 = 9,970.93 : x
  2. Step 2: Convert to fraction form
    15,015.40/20,721.84 = 9,970.93/x
  3. Step 3: Cross multiply
    15,015.40x = 20,721.84 × 9,970.93
  4. Step 4: Simplify right side
    15,015.40x = 206,615,912.50
  5. Step 5: Solve for x
    x = 206,615,912.50/15,015.40
  6. Step 6: Final answer
    x = 13,760.26

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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.