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Finding the Fourth Proportional to 72,971.34, 100,700.40 and 39,437.34

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Solution

The fourth proportional to 72,971.34, 100,700.40 and 39,437.34 is: 54,423.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,971.34 : 100,700.40 = 39,437.34 : x
  2. Step 2: Convert to fraction form
    72,971.34/100,700.40 = 39,437.34/x
  3. Step 3: Cross multiply
    72,971.34x = 100,700.40 × 39,437.34
  4. Step 4: Simplify right side
    72,971.34x = 3,971,355,912.94
  5. Step 5: Solve for x
    x = 3,971,355,912.94/72,971.34
  6. Step 6: Final answer
    x = 54,423.50

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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.