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Finding the Fourth Proportional to 15,929.94, 21,980.90 and 9,122.90

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Solution

The fourth proportional to 15,929.94, 21,980.90 and 9,122.90 is: 12,588.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,929.94 : 21,980.90 = 9,122.90 : x
  2. Step 2: Convert to fraction form
    15,929.94/21,980.90 = 9,122.90/x
  3. Step 3: Cross multiply
    15,929.94x = 21,980.90 × 9,122.90
  4. Step 4: Simplify right side
    15,929.94x = 200,529,530.84
  5. Step 5: Solve for x
    x = 200,529,530.84/15,929.94
  6. Step 6: Final answer
    x = 12,588.22

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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.