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Finding the Fourth Proportional to 15,697.68, 21,636.78 and 15,282.16

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Solution

The fourth proportional to 15,697.68, 21,636.78 and 15,282.16 is: 21,064.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,697.68 : 21,636.78 = 15,282.16 : x
  2. Step 2: Convert to fraction form
    15,697.68/21,636.78 = 15,282.16/x
  3. Step 3: Cross multiply
    15,697.68x = 21,636.78 × 15,282.16
  4. Step 4: Simplify right side
    15,697.68x = 330,656,733.84
  5. Step 5: Solve for x
    x = 330,656,733.84/15,697.68
  6. Step 6: Final answer
    x = 21,064.05

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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.