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Finding the Fourth Proportional to 21,891.40, 30,210.88 and 12,946.57

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Solution

The fourth proportional to 21,891.40, 30,210.88 and 12,946.57 is: 17,866.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,891.40 : 30,210.88 = 12,946.57 : x
  2. Step 2: Convert to fraction form
    21,891.40/30,210.88 = 12,946.57/x
  3. Step 3: Cross multiply
    21,891.40x = 30,210.88 × 12,946.57
  4. Step 4: Simplify right side
    21,891.40x = 391,127,315.84
  5. Step 5: Solve for x
    x = 391,127,315.84/21,891.40
  6. Step 6: Final answer
    x = 17,866.71

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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.