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Finding the Fourth Proportional to 99,698.64, 137,599.20 and 61,985.04

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Solution

The fourth proportional to 99,698.64, 137,599.20 and 61,985.04 is: 85,548.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,698.64 : 137,599.20 = 61,985.04 : x
  2. Step 2: Convert to fraction form
    99,698.64/137,599.20 = 61,985.04/x
  3. Step 3: Cross multiply
    99,698.64x = 137,599.20 × 61,985.04
  4. Step 4: Simplify right side
    99,698.64x = 8,529,091,915.97
  5. Step 5: Solve for x
    x = 8,529,091,915.97/99,698.64
  6. Step 6: Final answer
    x = 85,548.73

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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.