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Finding the Fourth Proportional to 73,979, 102,091.38 and 40,445

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Solution

The fourth proportional to 73,979, 102,091.38 and 40,445 is: 55,814.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,979 : 102,091.38 = 40,445 : x
  2. Step 2: Convert to fraction form
    73,979/102,091.38 = 40,445/x
  3. Step 3: Cross multiply
    73,979x = 102,091.38 × 40,445
  4. Step 4: Simplify right side
    73,979x = 4,129,085,864.10
  5. Step 5: Solve for x
    x = 4,129,085,864.10/73,979
  6. Step 6: Final answer
    x = 55,814.30

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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.