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Finding the Fourth Proportional to 103,421.80, 154,986.90 and 63,861.40

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Solution

The fourth proportional to 103,421.80, 154,986.90 and 63,861.40 is: 95,702.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,421.80 : 154,986.90 = 63,861.40 : x
  2. Step 2: Convert to fraction form
    103,421.80/154,986.90 = 63,861.40/x
  3. Step 3: Cross multiply
    103,421.80x = 154,986.90 × 63,861.40
  4. Step 4: Simplify right side
    103,421.80x = 9,897,680,415.66
  5. Step 5: Solve for x
    x = 9,897,680,415.66/103,421.80
  6. Step 6: Final answer
    x = 95,702.07

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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.