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Finding the Fourth Proportional to 78,068.70, 107,643.60 and 73,864.80

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Solution

The fourth proportional to 78,068.70, 107,643.60 and 73,864.80 is: 101,847.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,068.70 : 107,643.60 = 73,864.80 : x
  2. Step 2: Convert to fraction form
    78,068.70/107,643.60 = 73,864.80/x
  3. Step 3: Cross multiply
    78,068.70x = 107,643.60 × 73,864.80
  4. Step 4: Simplify right side
    78,068.70x = 7,951,072,985.28
  5. Step 5: Solve for x
    x = 7,951,072,985.28/78,068.70
  6. Step 6: Final answer
    x = 101,847.13

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1.5x scale

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.