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Finding the Fourth Proportional to 100,430.96, 138,584.64 and 60,143.69

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Solution

The fourth proportional to 100,430.96, 138,584.64 and 60,143.69 is: 82,992.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,430.96 : 138,584.64 = 60,143.69 : x
  2. Step 2: Convert to fraction form
    100,430.96/138,584.64 = 60,143.69/x
  3. Step 3: Cross multiply
    100,430.96x = 138,584.64 × 60,143.69
  4. Step 4: Simplify right side
    100,430.96x = 8,334,991,973.38
  5. Step 5: Solve for x
    x = 8,334,991,973.38/100,430.96
  6. Step 6: Final answer
    x = 82,992.25

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1.5x scale

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.