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Finding the Fourth Proportional to 78,006.20, 117,009.30 and 74,944.40

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Solution

The fourth proportional to 78,006.20, 117,009.30 and 74,944.40 is: 112,416.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,006.20 : 117,009.30 = 74,944.40 : x
  2. Step 2: Convert to fraction form
    78,006.20/117,009.30 = 74,944.40/x
  3. Step 3: Cross multiply
    78,006.20x = 117,009.30 × 74,944.40
  4. Step 4: Simplify right side
    78,006.20x = 8,769,191,782.92
  5. Step 5: Solve for x
    x = 8,769,191,782.92/78,006.20
  6. Step 6: Final answer
    x = 112,416.60

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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.