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Finding the Fourth Proportional to 72,315.60, 108,489.60 and 27,938.40

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Solution

The fourth proportional to 72,315.60, 108,489.60 and 27,938.40 is: 41,913.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,315.60 : 108,489.60 = 27,938.40 : x
  2. Step 2: Convert to fraction form
    72,315.60/108,489.60 = 27,938.40/x
  3. Step 3: Cross multiply
    72,315.60x = 108,489.60 × 27,938.40
  4. Step 4: Simplify right side
    72,315.60x = 3,031,025,840.64
  5. Step 5: Solve for x
    x = 3,031,025,840.64/72,315.60
  6. Step 6: Final answer
    x = 41,913.86

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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.