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Finding the Fourth Proportional to 19,879.20, 29,818.80 and 14,630.40

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Solution

The fourth proportional to 19,879.20, 29,818.80 and 14,630.40 is: 21,945.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,879.20 : 29,818.80 = 14,630.40 : x
  2. Step 2: Convert to fraction form
    19,879.20/29,818.80 = 14,630.40/x
  3. Step 3: Cross multiply
    19,879.20x = 29,818.80 × 14,630.40
  4. Step 4: Simplify right side
    19,879.20x = 436,260,971.52
  5. Step 5: Solve for x
    x = 436,260,971.52/19,879.20
  6. Step 6: Final answer
    x = 21,945.60

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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.