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Finding the Fourth Proportional to 15,908.68, 21,955.16 and 9,860.11

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Solution

The fourth proportional to 15,908.68, 21,955.16 and 9,860.11 is: 13,607.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,908.68 : 21,955.16 = 9,860.11 : x
  2. Step 2: Convert to fraction form
    15,908.68/21,955.16 = 9,860.11/x
  3. Step 3: Cross multiply
    15,908.68x = 21,955.16 × 9,860.11
  4. Step 4: Simplify right side
    15,908.68x = 216,480,292.67
  5. Step 5: Solve for x
    x = 216,480,292.67/15,908.68
  6. Step 6: Final answer
    x = 13,607.68

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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.