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Finding the Fourth Proportional to 15,894.80, 21,935.87 and 9,180.71

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Solution

The fourth proportional to 15,894.80, 21,935.87 and 9,180.71 is: 12,669.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,894.80 : 21,935.87 = 9,180.71 : x
  2. Step 2: Convert to fraction form
    15,894.80/21,935.87 = 9,180.71/x
  3. Step 3: Cross multiply
    15,894.80x = 21,935.87 × 9,180.71
  4. Step 4: Simplify right side
    15,894.80x = 201,386,861.07
  5. Step 5: Solve for x
    x = 201,386,861.07/15,894.80
  6. Step 6: Final answer
    x = 12,669.98

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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.