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Finding the Fourth Proportional to 100,740.88, 139,024.20 and 55,422.64

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Solution

The fourth proportional to 100,740.88, 139,024.20 and 55,422.64 is: 76,484.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,740.88 : 139,024.20 = 55,422.64 : x
  2. Step 2: Convert to fraction form
    100,740.88/139,024.20 = 55,422.64/x
  3. Step 3: Cross multiply
    100,740.88x = 139,024.20 × 55,422.64
  4. Step 4: Simplify right side
    100,740.88x = 7,705,088,187.89
  5. Step 5: Solve for x
    x = 7,705,088,187.89/100,740.88
  6. Step 6: Final answer
    x = 76,484.23

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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.