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Finding the Fourth Proportional to 22,811.40, 31,476.90 and 12,740.40

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Solution

The fourth proportional to 22,811.40, 31,476.90 and 12,740.40 is: 17,580.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    22,811.40 : 31,476.90 = 12,740.40 : x
  2. Step 2: Convert to fraction form
    22,811.40/31,476.90 = 12,740.40/x
  3. Step 3: Cross multiply
    22,811.40x = 31,476.90 × 12,740.40
  4. Step 4: Simplify right side
    22,811.40x = 401,028,296.76
  5. Step 5: Solve for x
    x = 401,028,296.76/22,811.40
  6. Step 6: Final answer
    x = 17,580.17

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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.