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Finding the Fourth Proportional to 485,625.60, 727,660.80 and 319,219.20

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Solution

The fourth proportional to 485,625.60, 727,660.80 and 319,219.20 is: 478,317.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,625.60 : 727,660.80 = 319,219.20 : x
  2. Step 2: Convert to fraction form
    485,625.60/727,660.80 = 319,219.20/x
  3. Step 3: Cross multiply
    485,625.60x = 727,660.80 × 319,219.20
  4. Step 4: Simplify right side
    485,625.60x = 232,283,298,447.36
  5. Step 5: Solve for x
    x = 232,283,298,447.36/485,625.60
  6. Step 6: Final answer
    x = 478,317.66

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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.