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Finding the Fourth Proportional to 15,369.65, 21,071.86 and 15,089.44

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Solution

The fourth proportional to 15,369.65, 21,071.86 and 15,089.44 is: 20,687.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,369.65 : 21,071.86 = 15,089.44 : x
  2. Step 2: Convert to fraction form
    15,369.65/21,071.86 = 15,089.44/x
  3. Step 3: Cross multiply
    15,369.65x = 21,071.86 × 15,089.44
  4. Step 4: Simplify right side
    15,369.65x = 317,962,461.80
  5. Step 5: Solve for x
    x = 317,962,461.80/15,369.65
  6. Step 6: Final answer
    x = 20,687.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.