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Finding the Fourth Proportional to 91,808.20, 137,420.70 and 65,564.20

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Solution

The fourth proportional to 91,808.20, 137,420.70 and 65,564.20 is: 98,138.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,808.20 : 137,420.70 = 65,564.20 : x
  2. Step 2: Convert to fraction form
    91,808.20/137,420.70 = 65,564.20/x
  3. Step 3: Cross multiply
    91,808.20x = 137,420.70 × 65,564.20
  4. Step 4: Simplify right side
    91,808.20x = 9,009,878,258.94
  5. Step 5: Solve for x
    x = 9,009,878,258.94/91,808.20
  6. Step 6: Final answer
    x = 98,138.06

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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.