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Finding the Fourth Proportional to 72,781.94, 100,430.96 and 40,950.16

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Solution

The fourth proportional to 72,781.94, 100,430.96 and 40,950.16 is: 56,506.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,781.94 : 100,430.96 = 40,950.16 : x
  2. Step 2: Convert to fraction form
    72,781.94/100,430.96 = 40,950.16/x
  3. Step 3: Cross multiply
    72,781.94x = 100,430.96 × 40,950.16
  4. Step 4: Simplify right side
    72,781.94x = 4,112,663,425.13
  5. Step 5: Solve for x
    x = 4,112,663,425.13/72,781.94
  6. Step 6: Final answer
    x = 56,506.65

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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.