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Finding the Fourth Proportional to 15,771.61, 21,914.18 and 15,607.08

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Solution

The fourth proportional to 15,771.61, 21,914.18 and 15,607.08 is: 21,685.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,771.61 : 21,914.18 = 15,607.08 : x
  2. Step 2: Convert to fraction form
    15,771.61/21,914.18 = 15,607.08/x
  3. Step 3: Cross multiply
    15,771.61x = 21,914.18 × 15,607.08
  4. Step 4: Simplify right side
    15,771.61x = 342,016,340.89
  5. Step 5: Solve for x
    x = 342,016,340.89/15,771.61
  6. Step 6: Final answer
    x = 21,685.57

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.