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Finding the Fourth Proportional to 281,428.69, 388,430.25 and 258,731.73

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Solution

The fourth proportional to 281,428.69, 388,430.25 and 258,731.73 is: 357,103.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    281,428.69 : 388,430.25 = 258,731.73 : x
  2. Step 2: Convert to fraction form
    281,428.69/388,430.25 = 258,731.73/x
  3. Step 3: Cross multiply
    281,428.69x = 388,430.25 × 258,731.73
  4. Step 4: Simplify right side
    281,428.69x = 100,499,230,566.83
  5. Step 5: Solve for x
    x = 100,499,230,566.83/281,428.69
  6. Step 6: Final answer
    x = 357,103.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.