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Finding the Fourth Proportional to 98,748.40, 147,903.90 and 81,252.40

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Solution

The fourth proportional to 98,748.40, 147,903.90 and 81,252.40 is: 121,698.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,748.40 : 147,903.90 = 81,252.40 : x
  2. Step 2: Convert to fraction form
    98,748.40/147,903.90 = 81,252.40/x
  3. Step 3: Cross multiply
    98,748.40x = 147,903.90 × 81,252.40
  4. Step 4: Simplify right side
    98,748.40x = 12,017,546,844.36
  5. Step 5: Solve for x
    x = 12,017,546,844.36/98,748.40
  6. Step 6: Final answer
    x = 121,698.65

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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.