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Finding the Fourth Proportional to 100,815.60, 139,118.94 and 55,484.76

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Solution

The fourth proportional to 100,815.60, 139,118.94 and 55,484.76 is: 76,565.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,815.60 : 139,118.94 = 55,484.76 : x
  2. Step 2: Convert to fraction form
    100,815.60/139,118.94 = 55,484.76/x
  3. Step 3: Cross multiply
    100,815.60x = 139,118.94 × 55,484.76
  4. Step 4: Simplify right side
    100,815.60x = 7,718,980,997.35
  5. Step 5: Solve for x
    x = 7,718,980,997.35/100,815.60
  6. Step 6: Final answer
    x = 76,565.34

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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.