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Finding the Fourth Proportional to 478,440.10, 717,660.15 and 212,719.60

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Solution

The fourth proportional to 478,440.10, 717,660.15 and 212,719.60 is: 319,079.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    478,440.10 : 717,660.15 = 212,719.60 : x
  2. Step 2: Convert to fraction form
    478,440.10/717,660.15 = 212,719.60/x
  3. Step 3: Cross multiply
    478,440.10x = 717,660.15 × 212,719.60
  4. Step 4: Simplify right side
    478,440.10x = 152,660,380,043.94
  5. Step 5: Solve for x
    x = 152,660,380,043.94/478,440.10
  6. Step 6: Final answer
    x = 319,079.40

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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.