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Finding the Fourth Proportional to 72,678.08, 100,235.59 and 51,239.12

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Solution

The fourth proportional to 72,678.08, 100,235.59 and 51,239.12 is: 70,667.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,678.08 : 100,235.59 = 51,239.12 : x
  2. Step 2: Convert to fraction form
    72,678.08/100,235.59 = 51,239.12/x
  3. Step 3: Cross multiply
    72,678.08x = 100,235.59 × 51,239.12
  4. Step 4: Simplify right side
    72,678.08x = 5,135,982,795.01
  5. Step 5: Solve for x
    x = 5,135,982,795.01/72,678.08
  6. Step 6: Final answer
    x = 70,667.56

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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.