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Finding the Fourth Proportional to 15,900.55, 21,938.31 and 9,938.28

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Solution

The fourth proportional to 15,900.55, 21,938.31 and 9,938.28 is: 13,712.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,900.55 : 21,938.31 = 9,938.28 : x
  2. Step 2: Convert to fraction form
    15,900.55/21,938.31 = 9,938.28/x
  3. Step 3: Cross multiply
    15,900.55x = 21,938.31 × 9,938.28
  4. Step 4: Simplify right side
    15,900.55x = 218,029,067.51
  5. Step 5: Solve for x
    x = 218,029,067.51/15,900.55
  6. Step 6: Final answer
    x = 13,712.05

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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.