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Finding the Fourth Proportional to 28,967.81, 39,978.93 and 17,643.95

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Solution

The fourth proportional to 28,967.81, 39,978.93 and 17,643.95 is: 24,350.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,967.81 : 39,978.93 = 17,643.95 : x
  2. Step 2: Convert to fraction form
    28,967.81/39,978.93 = 17,643.95/x
  3. Step 3: Cross multiply
    28,967.81x = 39,978.93 × 17,643.95
  4. Step 4: Simplify right side
    28,967.81x = 705,386,042.08
  5. Step 5: Solve for x
    x = 705,386,042.08/28,967.81
  6. Step 6: Final answer
    x = 24,350.69

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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.