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Finding the Fourth Proportional to 143,751.54, 215,388.95 and 87,421.26

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Solution

The fourth proportional to 143,751.54, 215,388.95 and 87,421.26 is: 130,986.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,751.54 : 215,388.95 = 87,421.26 : x
  2. Step 2: Convert to fraction form
    143,751.54/215,388.95 = 87,421.26/x
  3. Step 3: Cross multiply
    143,751.54x = 215,388.95 × 87,421.26
  4. Step 4: Simplify right side
    143,751.54x = 18,829,572,961.97
  5. Step 5: Solve for x
    x = 18,829,572,961.97/143,751.54
  6. Step 6: Final answer
    x = 130,986.93

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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.