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Finding the Fourth Proportional to 72,630.20, 108,923.70 and 28,231.40

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Solution

The fourth proportional to 72,630.20, 108,923.70 and 28,231.40 is: 42,338.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,630.20 : 108,923.70 = 28,231.40 : x
  2. Step 2: Convert to fraction form
    72,630.20/108,923.70 = 28,231.40/x
  3. Step 3: Cross multiply
    72,630.20x = 108,923.70 × 28,231.40
  4. Step 4: Simplify right side
    72,630.20x = 3,075,068,544.18
  5. Step 5: Solve for x
    x = 3,075,068,544.18/72,630.20
  6. Step 6: Final answer
    x = 42,338.70

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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.