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Finding the Fourth Proportional to 15,690.81, 21,650.69 and 8,975.05

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Solution

The fourth proportional to 15,690.81, 21,650.69 and 8,975.05 is: 12,384.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,690.81 : 21,650.69 = 8,975.05 : x
  2. Step 2: Convert to fraction form
    15,690.81/21,650.69 = 8,975.05/x
  3. Step 3: Cross multiply
    15,690.81x = 21,650.69 × 8,975.05
  4. Step 4: Simplify right side
    15,690.81x = 194,316,115.38
  5. Step 5: Solve for x
    x = 194,316,115.38/15,690.81
  6. Step 6: Final answer
    x = 12,384.07

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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.