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Finding the Fourth Proportional to 101,281.32, 139,807.08 and 90,651.96

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Solution

The fourth proportional to 101,281.32, 139,807.08 and 90,651.96 is: 125,134.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,281.32 : 139,807.08 = 90,651.96 : x
  2. Step 2: Convert to fraction form
    101,281.32/139,807.08 = 90,651.96/x
  3. Step 3: Cross multiply
    101,281.32x = 139,807.08 × 90,651.96
  4. Step 4: Simplify right side
    101,281.32x = 12,673,785,823.88
  5. Step 5: Solve for x
    x = 12,673,785,823.88/101,281.32
  6. Step 6: Final answer
    x = 125,134.49

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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.