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Finding the Fourth Proportional to 480,378.20, 718,493.70 and 405,728.60

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Solution

The fourth proportional to 480,378.20, 718,493.70 and 405,728.60 is: 606,841.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    480,378.20 : 718,493.70 = 405,728.60 : x
  2. Step 2: Convert to fraction form
    480,378.20/718,493.70 = 405,728.60/x
  3. Step 3: Cross multiply
    480,378.20x = 718,493.70 × 405,728.60
  4. Step 4: Simplify right side
    480,378.20x = 291,513,443,009.82
  5. Step 5: Solve for x
    x = 291,513,443,009.82/480,378.20
  6. Step 6: Final answer
    x = 606,841.53

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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.