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Finding the Fourth Proportional to 78,908.70, 118,314.45 and 45,612.30

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Solution

The fourth proportional to 78,908.70, 118,314.45 and 45,612.30 is: 68,390.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,908.70 : 118,314.45 = 45,612.30 : x
  2. Step 2: Convert to fraction form
    78,908.70/118,314.45 = 45,612.30/x
  3. Step 3: Cross multiply
    78,908.70x = 118,314.45 × 45,612.30
  4. Step 4: Simplify right side
    78,908.70x = 5,396,594,187.74
  5. Step 5: Solve for x
    x = 5,396,594,187.74/78,908.70
  6. Step 6: Final answer
    x = 68,390.36

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1.5x scale

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.