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Finding the Fourth Proportional to 98,817.68, 136,581.72 and 87,406.40

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Solution

The fourth proportional to 98,817.68, 136,581.72 and 87,406.40 is: 120,809.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,817.68 : 136,581.72 = 87,406.40 : x
  2. Step 2: Convert to fraction form
    98,817.68/136,581.72 = 87,406.40/x
  3. Step 3: Cross multiply
    98,817.68x = 136,581.72 × 87,406.40
  4. Step 4: Simplify right side
    98,817.68x = 11,938,116,451.01
  5. Step 5: Solve for x
    x = 11,938,116,451.01/98,817.68
  6. Step 6: Final answer
    x = 120,809.52

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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.