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Finding the Fourth Proportional to 72,139.14, 108,214.88 and 18,838.22

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Solution

The fourth proportional to 72,139.14, 108,214.88 and 18,838.22 is: 28,258.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,139.14 : 108,214.88 = 18,838.22 : x
  2. Step 2: Convert to fraction form
    72,139.14/108,214.88 = 18,838.22/x
  3. Step 3: Cross multiply
    72,139.14x = 108,214.88 × 18,838.22
  4. Step 4: Simplify right side
    72,139.14x = 2,038,575,081.45
  5. Step 5: Solve for x
    x = 2,038,575,081.45/72,139.14
  6. Step 6: Final answer
    x = 28,258.93

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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.