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Finding the Fourth Proportional to 143,476.40, 215,117.40 and 76,019.60

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Solution

The fourth proportional to 143,476.40, 215,117.40 and 76,019.60 is: 113,977.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,476.40 : 215,117.40 = 76,019.60 : x
  2. Step 2: Convert to fraction form
    143,476.40/215,117.40 = 76,019.60/x
  3. Step 3: Cross multiply
    143,476.40x = 215,117.40 × 76,019.60
  4. Step 4: Simplify right side
    143,476.40x = 16,353,138,701.04
  5. Step 5: Solve for x
    x = 16,353,138,701.04/143,476.40
  6. Step 6: Final answer
    x = 113,977.90

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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.