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Finding the Fourth Proportional to 101,386.66, 139,867.08 and 65,588.21

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Solution

The fourth proportional to 101,386.66, 139,867.08 and 65,588.21 is: 90,481.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,386.66 : 139,867.08 = 65,588.21 : x
  2. Step 2: Convert to fraction form
    101,386.66/139,867.08 = 65,588.21/x
  3. Step 3: Cross multiply
    101,386.66x = 139,867.08 × 65,588.21
  4. Step 4: Simplify right side
    101,386.66x = 9,173,631,415.13
  5. Step 5: Solve for x
    x = 9,173,631,415.13/101,386.66
  6. Step 6: Final answer
    x = 90,481.64

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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.