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Finding the Fourth Proportional to 72,918.76, 100,627.88 and 39,384.76

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Solution

The fourth proportional to 72,918.76, 100,627.88 and 39,384.76 is: 54,350.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,918.76 : 100,627.88 = 39,384.76 : x
  2. Step 2: Convert to fraction form
    72,918.76/100,627.88 = 39,384.76/x
  3. Step 3: Cross multiply
    72,918.76x = 100,627.88 × 39,384.76
  4. Step 4: Simplify right side
    72,918.76x = 3,963,204,903.11
  5. Step 5: Solve for x
    x = 3,963,204,903.11/72,918.76
  6. Step 6: Final answer
    x = 54,350.96

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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.