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Finding the Fourth Proportional to 72,640.46, 100,012.11 and 61,987.34

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Solution

The fourth proportional to 72,640.46, 100,012.11 and 61,987.34 is: 85,344.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,640.46 : 100,012.11 = 61,987.34 : x
  2. Step 2: Convert to fraction form
    72,640.46/100,012.11 = 61,987.34/x
  3. Step 3: Cross multiply
    72,640.46x = 100,012.11 × 61,987.34
  4. Step 4: Simplify right side
    72,640.46x = 6,199,484,666.69
  5. Step 5: Solve for x
    x = 6,199,484,666.69/72,640.46
  6. Step 6: Final answer
    x = 85,344.79

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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.