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Finding the Fourth Proportional to 68,390.80, 102,586.20 and 61,133.20

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Solution

The fourth proportional to 68,390.80, 102,586.20 and 61,133.20 is: 91,699.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,390.80 : 102,586.20 = 61,133.20 : x
  2. Step 2: Convert to fraction form
    68,390.80/102,586.20 = 61,133.20/x
  3. Step 3: Cross multiply
    68,390.80x = 102,586.20 × 61,133.20
  4. Step 4: Simplify right side
    68,390.80x = 6,271,422,681.84
  5. Step 5: Solve for x
    x = 6,271,422,681.84/68,390.80
  6. Step 6: Final answer
    x = 91,699.80

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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.