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Finding the Fourth Proportional to 98,412.80, 147,619.20 and 87,915.20

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Solution

The fourth proportional to 98,412.80, 147,619.20 and 87,915.20 is: 131,872.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,412.80 : 147,619.20 = 87,915.20 : x
  2. Step 2: Convert to fraction form
    98,412.80/147,619.20 = 87,915.20/x
  3. Step 3: Cross multiply
    98,412.80x = 147,619.20 × 87,915.20
  4. Step 4: Simplify right side
    98,412.80x = 12,977,971,491.84
  5. Step 5: Solve for x
    x = 12,977,971,491.84/98,412.80
  6. Step 6: Final answer
    x = 131,872.80

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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.