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Finding the Fourth Proportional to 15,805.72, 21,808.74 and 9,518.50

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Solution

The fourth proportional to 15,805.72, 21,808.74 and 9,518.50 is: 13,133.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,805.72 : 21,808.74 = 9,518.50 : x
  2. Step 2: Convert to fraction form
    15,805.72/21,808.74 = 9,518.50/x
  3. Step 3: Cross multiply
    15,805.72x = 21,808.74 × 9,518.50
  4. Step 4: Simplify right side
    15,805.72x = 207,586,491.69
  5. Step 5: Solve for x
    x = 207,586,491.69/15,805.72
  6. Step 6: Final answer
    x = 13,133.63

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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.