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Finding the Fourth Proportional to 81,697.84, 122,607.76 and 60,686.40

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Solution

The fourth proportional to 81,697.84, 122,607.76 and 60,686.40 is: 91,074.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,697.84 : 122,607.76 = 60,686.40 : x
  2. Step 2: Convert to fraction form
    81,697.84/122,607.76 = 60,686.40/x
  3. Step 3: Cross multiply
    81,697.84x = 122,607.76 × 60,686.40
  4. Step 4: Simplify right side
    81,697.84x = 7,440,623,566.46
  5. Step 5: Solve for x
    x = 7,440,623,566.46/81,697.84
  6. Step 6: Final answer
    x = 91,074.91

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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.