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Finding the Fourth Proportional to 768,812.80, 1,153,219.20 and 319,384.30

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Solution

The fourth proportional to 768,812.80, 1,153,219.20 and 319,384.30 is: 479,076.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    768,812.80 : 1,153,219.20 = 319,384.30 : x
  2. Step 2: Convert to fraction form
    768,812.80/1,153,219.20 = 319,384.30/x
  3. Step 3: Cross multiply
    768,812.80x = 1,153,219.20 × 319,384.30
  4. Step 4: Simplify right side
    768,812.80x = 368,320,106,938.56
  5. Step 5: Solve for x
    x = 368,320,106,938.56/768,812.80
  6. Step 6: Final answer
    x = 479,076.45

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Similar ratio
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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.