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Finding the Fourth Proportional to 21,690.76, 29,937.34 and 12,259.32

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Solution

The fourth proportional to 21,690.76, 29,937.34 and 12,259.32 is: 16,920.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,690.76 : 29,937.34 = 12,259.32 : x
  2. Step 2: Convert to fraction form
    21,690.76/29,937.34 = 12,259.32/x
  3. Step 3: Cross multiply
    21,690.76x = 29,937.34 × 12,259.32
  4. Step 4: Simplify right side
    21,690.76x = 367,011,431.01
  5. Step 5: Solve for x
    x = 367,011,431.01/21,690.76
  6. Step 6: Final answer
    x = 16,920.17

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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.