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Finding the Fourth Proportional to 28,966.69, 39,978.31 and 18,357.29

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Solution

The fourth proportional to 28,966.69, 39,978.31 and 18,357.29 is: 25,335.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,966.69 : 39,978.31 = 18,357.29 : x
  2. Step 2: Convert to fraction form
    28,966.69/39,978.31 = 18,357.29/x
  3. Step 3: Cross multiply
    28,966.69x = 39,978.31 × 18,357.29
  4. Step 4: Simplify right side
    28,966.69x = 733,893,430.38
  5. Step 5: Solve for x
    x = 733,893,430.38/28,966.69
  6. Step 6: Final answer
    x = 25,335.77

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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.