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Finding the Fourth Proportional to 288,618.20, 432,927.30 and 78,255.80

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Solution

The fourth proportional to 288,618.20, 432,927.30 and 78,255.80 is: 117,383.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    288,618.20 : 432,927.30 = 78,255.80 : x
  2. Step 2: Convert to fraction form
    288,618.20/432,927.30 = 78,255.80/x
  3. Step 3: Cross multiply
    288,618.20x = 432,927.30 × 78,255.80
  4. Step 4: Simplify right side
    288,618.20x = 33,879,072,203.34
  5. Step 5: Solve for x
    x = 33,879,072,203.34/288,618.20
  6. Step 6: Final answer
    x = 117,383.70

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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.