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Finding the Fourth Proportional to 102,690.40, 153,776.40 and 67,439.20

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Solution

The fourth proportional to 102,690.40, 153,776.40 and 67,439.20 is: 100,988.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,690.40 : 153,776.40 = 67,439.20 : x
  2. Step 2: Convert to fraction form
    102,690.40/153,776.40 = 67,439.20/x
  3. Step 3: Cross multiply
    102,690.40x = 153,776.40 × 67,439.20
  4. Step 4: Simplify right side
    102,690.40x = 10,370,557,394.88
  5. Step 5: Solve for x
    x = 10,370,557,394.88/102,690.40
  6. Step 6: Final answer
    x = 100,988.58

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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.