Home / 205,428.40-308,142.60-72,458.80

Finding the Fourth Proportional to 205,428.40, 308,142.60 and 72,458.80

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Solution

The fourth proportional to 205,428.40, 308,142.60 and 72,458.80 is: 108,688.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,428.40 : 308,142.60 = 72,458.80 : x
  2. Step 2: Convert to fraction form
    205,428.40/308,142.60 = 72,458.80/x
  3. Step 3: Cross multiply
    205,428.40x = 308,142.60 × 72,458.80
  4. Step 4: Simplify right side
    205,428.40x = 22,327,643,024.88
  5. Step 5: Solve for x
    x = 22,327,643,024.88/205,428.40
  6. Step 6: Final answer
    x = 108,688.20

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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.