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Finding the Fourth Proportional to 99,320.40, 148,980.60 and 81,824.40

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Solution

The fourth proportional to 99,320.40, 148,980.60 and 81,824.40 is: 122,736.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,320.40 : 148,980.60 = 81,824.40 : x
  2. Step 2: Convert to fraction form
    99,320.40/148,980.60 = 81,824.40/x
  3. Step 3: Cross multiply
    99,320.40x = 148,980.60 × 81,824.40
  4. Step 4: Simplify right side
    99,320.40x = 12,190,248,206.64
  5. Step 5: Solve for x
    x = 12,190,248,206.64/99,320.40
  6. Step 6: Final answer
    x = 122,736.60

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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.