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Finding the Fourth Proportional to 72,707.84, 100,342.96 and 40,879.68

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Solution

The fourth proportional to 72,707.84, 100,342.96 and 40,879.68 is: 56,417.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,707.84 : 100,342.96 = 40,879.68 : x
  2. Step 2: Convert to fraction form
    72,707.84/100,342.96 = 40,879.68/x
  3. Step 3: Cross multiply
    72,707.84x = 100,342.96 × 40,879.68
  4. Step 4: Simplify right side
    72,707.84x = 4,101,988,095.05
  5. Step 5: Solve for x
    x = 4,101,988,095.05/72,707.84
  6. Step 6: Final answer
    x = 56,417.41

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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.