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Finding the Fourth Proportional to 143,790.60, 215,685.90 and 118,421.40

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Solution

The fourth proportional to 143,790.60, 215,685.90 and 118,421.40 is: 177,632.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,790.60 : 215,685.90 = 118,421.40 : x
  2. Step 2: Convert to fraction form
    143,790.60/215,685.90 = 118,421.40/x
  3. Step 3: Cross multiply
    143,790.60x = 215,685.90 × 118,421.40
  4. Step 4: Simplify right side
    143,790.60x = 25,541,826,238.26
  5. Step 5: Solve for x
    x = 25,541,826,238.26/143,790.60
  6. Step 6: Final answer
    x = 177,632.10

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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.