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Finding the Fourth Proportional to 78,486.70, 117,730.05 and 45,309.10

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Solution

The fourth proportional to 78,486.70, 117,730.05 and 45,309.10 is: 67,963.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,486.70 : 117,730.05 = 45,309.10 : x
  2. Step 2: Convert to fraction form
    78,486.70/117,730.05 = 45,309.10/x
  3. Step 3: Cross multiply
    78,486.70x = 117,730.05 × 45,309.10
  4. Step 4: Simplify right side
    78,486.70x = 5,334,242,608.46
  5. Step 5: Solve for x
    x = 5,334,242,608.46/78,486.70
  6. Step 6: Final answer
    x = 67,963.65

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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.