Home / 81,768,979.86-122,708,014.02-42,413,504.78

Finding the Fourth Proportional to 81,768,979.86, 122,708,014.02 and 42,413,504.78

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Solution

The fourth proportional to 81,768,979.86, 122,708,014.02 and 42,413,504.78 is: 63,648,549.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,768,979.86 : 122,708,014.02 = 42,413,504.78 : x
  2. Step 2: Convert to fraction form
    81,768,979.86/122,708,014.02 = 42,413,504.78/x
  3. Step 3: Cross multiply
    81,768,979.86x = 122,708,014.02 × 42,413,504.78
  4. Step 4: Simplify right side
    81,768,979.86x = 5,204,476,938,568,037
  5. Step 5: Solve for x
    x = 5,204,476,938,568,037/81,768,979.86
  6. Step 6: Final answer
    x = 63,648,549.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.