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Finding the Fourth Proportional to 78,771.75, 108,707.63 and 42,963.74

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Solution

The fourth proportional to 78,771.75, 108,707.63 and 42,963.74 is: 59,291.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,771.75 : 108,707.63 = 42,963.74 : x
  2. Step 2: Convert to fraction form
    78,771.75/108,707.63 = 42,963.74/x
  3. Step 3: Cross multiply
    78,771.75x = 108,707.63 × 42,963.74
  4. Step 4: Simplify right side
    78,771.75x = 4,670,486,351.34
  5. Step 5: Solve for x
    x = 4,670,486,351.34/78,771.75
  6. Step 6: Final answer
    x = 59,291.39

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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.