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Finding the Fourth Proportional to 21,322.60, 31,983.90 and 19,281.40

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Solution

The fourth proportional to 21,322.60, 31,983.90 and 19,281.40 is: 28,922.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,322.60 : 31,983.90 = 19,281.40 : x
  2. Step 2: Convert to fraction form
    21,322.60/31,983.90 = 19,281.40/x
  3. Step 3: Cross multiply
    21,322.60x = 31,983.90 × 19,281.40
  4. Step 4: Simplify right side
    21,322.60x = 616,694,369.46
  5. Step 5: Solve for x
    x = 616,694,369.46/21,322.60
  6. Step 6: Final answer
    x = 28,922.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.