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Finding the Fourth Proportional to 153,580.60, 211,958.40 and 85,603.78

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Solution

The fourth proportional to 153,580.60, 211,958.40 and 85,603.78 is: 118,142.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,580.60 : 211,958.40 = 85,603.78 : x
  2. Step 2: Convert to fraction form
    153,580.60/211,958.40 = 85,603.78/x
  3. Step 3: Cross multiply
    153,580.60x = 211,958.40 × 85,603.78
  4. Step 4: Simplify right side
    153,580.60x = 18,144,440,242.75
  5. Step 5: Solve for x
    x = 18,144,440,242.75/153,580.60
  6. Step 6: Final answer
    x = 118,142.79

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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.