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Finding the Fourth Proportional to 15,867.95, 21,888.73 and 9,903.06

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Solution

The fourth proportional to 15,867.95, 21,888.73 and 9,903.06 is: 13,660.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,867.95 : 21,888.73 = 9,903.06 : x
  2. Step 2: Convert to fraction form
    15,867.95/21,888.73 = 9,903.06/x
  3. Step 3: Cross multiply
    15,867.95x = 21,888.73 × 9,903.06
  4. Step 4: Simplify right side
    15,867.95x = 216,765,418.89
  5. Step 5: Solve for x
    x = 216,765,418.89/15,867.95
  6. Step 6: Final answer
    x = 13,660.58

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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.