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Finding the Fourth Proportional to 100,408.68, 138,450.36 and 64,061.50

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Solution

The fourth proportional to 100,408.68, 138,450.36 and 64,061.50 is: 88,332.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,408.68 : 138,450.36 = 64,061.50 : x
  2. Step 2: Convert to fraction form
    100,408.68/138,450.36 = 64,061.50/x
  3. Step 3: Cross multiply
    100,408.68x = 138,450.36 × 64,061.50
  4. Step 4: Simplify right side
    100,408.68x = 8,869,337,890.84
  5. Step 5: Solve for x
    x = 8,869,337,890.84/100,408.68
  6. Step 6: Final answer
    x = 88,332.38

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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.