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Finding the Fourth Proportional to 72,478.81, 100,021.59 and 40,214.03

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Solution

The fourth proportional to 72,478.81, 100,021.59 and 40,214.03 is: 55,495.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,478.81 : 100,021.59 = 40,214.03 : x
  2. Step 2: Convert to fraction form
    72,478.81/100,021.59 = 40,214.03/x
  3. Step 3: Cross multiply
    72,478.81x = 100,021.59 × 40,214.03
  4. Step 4: Simplify right side
    72,478.81x = 4,022,271,220.91
  5. Step 5: Solve for x
    x = 4,022,271,220.91/72,478.81
  6. Step 6: Final answer
    x = 55,495.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.