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Finding the Fourth Proportional to 72,470.88, 100,009.62 and 40,645.58

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Solution

The fourth proportional to 72,470.88, 100,009.62 and 40,645.58 is: 56,090.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,470.88 : 100,009.62 = 40,645.58 : x
  2. Step 2: Convert to fraction form
    72,470.88/100,009.62 = 40,645.58/x
  3. Step 3: Cross multiply
    72,470.88x = 100,009.62 × 40,645.58
  4. Step 4: Simplify right side
    72,470.88x = 4,064,948,510.43
  5. Step 5: Solve for x
    x = 4,064,948,510.43/72,470.88
  6. Step 6: Final answer
    x = 56,090.78

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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.