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Finding the Fourth Proportional to 78,392.85, 118,112.25 and 70,905.06

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Solution

The fourth proportional to 78,392.85, 118,112.25 and 70,905.06 is: 106,830.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,392.85 : 118,112.25 = 70,905.06 : x
  2. Step 2: Convert to fraction form
    78,392.85/118,112.25 = 70,905.06/x
  3. Step 3: Cross multiply
    78,392.85x = 118,112.25 × 70,905.06
  4. Step 4: Simplify right side
    78,392.85x = 8,374,756,172.99
  5. Step 5: Solve for x
    x = 8,374,756,172.99/78,392.85
  6. Step 6: Final answer
    x = 106,830.61

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.