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Finding the Fourth Proportional to 268,604.80, 402,421.20 and 128,053.60

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Solution

The fourth proportional to 268,604.80, 402,421.20 and 128,053.60 is: 191,848.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    268,604.80 : 402,421.20 = 128,053.60 : x
  2. Step 2: Convert to fraction form
    268,604.80/402,421.20 = 128,053.60/x
  3. Step 3: Cross multiply
    268,604.80x = 402,421.20 × 128,053.60
  4. Step 4: Simplify right side
    268,604.80x = 51,531,483,376.32
  5. Step 5: Solve for x
    x = 51,531,483,376.32/268,604.80
  6. Step 6: Final answer
    x = 191,848.71

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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.