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Finding the Fourth Proportional to 72,761.51, 100,409.86 and 40,930.45

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Solution

The fourth proportional to 72,761.51, 100,409.86 and 40,930.45 is: 56,483.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,761.51 : 100,409.86 = 40,930.45 : x
  2. Step 2: Convert to fraction form
    72,761.51/100,409.86 = 40,930.45/x
  3. Step 3: Cross multiply
    72,761.51x = 100,409.86 × 40,930.45
  4. Step 4: Simplify right side
    72,761.51x = 4,109,820,754.24
  5. Step 5: Solve for x
    x = 4,109,820,754.24/72,761.51
  6. Step 6: Final answer
    x = 56,483.45

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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.