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Finding the Fourth Proportional to 99,307.40, 148,961.10 and 81,811.40

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Solution

The fourth proportional to 99,307.40, 148,961.10 and 81,811.40 is: 122,717.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,307.40 : 148,961.10 = 81,811.40 : x
  2. Step 2: Convert to fraction form
    99,307.40/148,961.10 = 81,811.40/x
  3. Step 3: Cross multiply
    99,307.40x = 148,961.10 × 81,811.40
  4. Step 4: Simplify right side
    99,307.40x = 12,186,716,136.54
  5. Step 5: Solve for x
    x = 12,186,716,136.54/99,307.40
  6. Step 6: Final answer
    x = 122,717.10

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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.