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Finding the Fourth Proportional to 65,910, 90,977.88 and 40,068.36

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Solution

The fourth proportional to 65,910, 90,977.88 and 40,068.36 is: 55,307.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,910 : 90,977.88 = 40,068.36 : x
  2. Step 2: Convert to fraction form
    65,910/90,977.88 = 40,068.36/x
  3. Step 3: Cross multiply
    65,910x = 90,977.88 × 40,068.36
  4. Step 4: Simplify right side
    65,910x = 3,645,334,447.88
  5. Step 5: Solve for x
    x = 3,645,334,447.88/65,910
  6. Step 6: Final answer
    x = 55,307.76

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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.