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Finding the Fourth Proportional to 21,891.42, 30,210.12 and 12,942.14

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Solution

The fourth proportional to 21,891.42, 30,210.12 and 12,942.14 is: 17,860.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,891.42 : 30,210.12 = 12,942.14 : x
  2. Step 2: Convert to fraction form
    21,891.42/30,210.12 = 12,942.14/x
  3. Step 3: Cross multiply
    21,891.42x = 30,210.12 × 12,942.14
  4. Step 4: Simplify right side
    21,891.42x = 390,983,602.46
  5. Step 5: Solve for x
    x = 390,983,602.46/21,891.42
  6. Step 6: Final answer
    x = 17,860.13

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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.