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Finding the Fourth Proportional to 72,641.34, 100,239.66 and 40,815.54

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Solution

The fourth proportional to 72,641.34, 100,239.66 and 40,815.54 is: 56,322.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,641.34 : 100,239.66 = 40,815.54 : x
  2. Step 2: Convert to fraction form
    72,641.34/100,239.66 = 40,815.54/x
  3. Step 3: Cross multiply
    72,641.34x = 100,239.66 × 40,815.54
  4. Step 4: Simplify right side
    72,641.34x = 4,091,335,852.32
  5. Step 5: Solve for x
    x = 4,091,335,852.32/72,641.34
  6. Step 6: Final answer
    x = 56,322.42

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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.