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Finding the Fourth Proportional to 155,421.07, 214,480.72 and 87,438.07

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Solution

The fourth proportional to 155,421.07, 214,480.72 and 87,438.07 is: 120,664.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,421.07 : 214,480.72 = 87,438.07 : x
  2. Step 2: Convert to fraction form
    155,421.07/214,480.72 = 87,438.07/x
  3. Step 3: Cross multiply
    155,421.07x = 214,480.72 × 87,438.07
  4. Step 4: Simplify right side
    155,421.07x = 18,753,780,209.01
  5. Step 5: Solve for x
    x = 18,753,780,209.01/155,421.07
  6. Step 6: Final answer
    x = 120,664.34

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.