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Finding the Fourth Proportional to 78,794.79, 108,734.85 and 42,985.50

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Solution

The fourth proportional to 78,794.79, 108,734.85 and 42,985.50 is: 59,318.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,794.79 : 108,734.85 = 42,985.50 : x
  2. Step 2: Convert to fraction form
    78,794.79/108,734.85 = 42,985.50/x
  3. Step 3: Cross multiply
    78,794.79x = 108,734.85 × 42,985.50
  4. Step 4: Simplify right side
    78,794.79x = 4,674,021,894.68
  5. Step 5: Solve for x
    x = 4,674,021,894.68/78,794.79
  6. Step 6: Final answer
    x = 59,318.92

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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.