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Finding the Fourth Proportional to 100,836.96, 139,117.68 and 100,681.44

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Solution

The fourth proportional to 100,836.96, 139,117.68 and 100,681.44 is: 138,903.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,836.96 : 139,117.68 = 100,681.44 : x
  2. Step 2: Convert to fraction form
    100,836.96/139,117.68 = 100,681.44/x
  3. Step 3: Cross multiply
    100,836.96x = 139,117.68 × 100,681.44
  4. Step 4: Simplify right side
    100,836.96x = 14,006,568,351.86
  5. Step 5: Solve for x
    x = 14,006,568,351.86/100,836.96
  6. Step 6: Final answer
    x = 138,903.12

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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.