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Finding the Fourth Proportional to 72,639.96, 100,011.42 and 61,986.84

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Solution

The fourth proportional to 72,639.96, 100,011.42 and 61,986.84 is: 85,344.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,639.96 : 100,011.42 = 61,986.84 : x
  2. Step 2: Convert to fraction form
    72,639.96/100,011.42 = 61,986.84/x
  3. Step 3: Cross multiply
    72,639.96x = 100,011.42 × 61,986.84
  4. Step 4: Simplify right side
    72,639.96x = 6,199,391,889.71
  5. Step 5: Solve for x
    x = 6,199,391,889.71/72,639.96
  6. Step 6: Final answer
    x = 85,344.10

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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.