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Finding the Fourth Proportional to 255,715.60, 383,602.20 and 78,221.20

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Solution

The fourth proportional to 255,715.60, 383,602.20 and 78,221.20 is: 117,340.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    255,715.60 : 383,602.20 = 78,221.20 : x
  2. Step 2: Convert to fraction form
    255,715.60/383,602.20 = 78,221.20/x
  3. Step 3: Cross multiply
    255,715.60x = 383,602.20 × 78,221.20
  4. Step 4: Simplify right side
    255,715.60x = 30,005,824,406.64
  5. Step 5: Solve for x
    x = 30,005,824,406.64/255,715.60
  6. Step 6: Final answer
    x = 117,340.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.