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Finding the Fourth Proportional to 30,578.60, 45,867.90 and 21,247.40

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Solution

The fourth proportional to 30,578.60, 45,867.90 and 21,247.40 is: 31,871.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,578.60 : 45,867.90 = 21,247.40 : x
  2. Step 2: Convert to fraction form
    30,578.60/45,867.90 = 21,247.40/x
  3. Step 3: Cross multiply
    30,578.60x = 45,867.90 × 21,247.40
  4. Step 4: Simplify right side
    30,578.60x = 974,573,618.46
  5. Step 5: Solve for x
    x = 974,573,618.46/30,578.60
  6. Step 6: Final answer
    x = 31,871.10

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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.