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Finding the Fourth Proportional to 28,932, 39,926.40 and 15,684

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Solution

The fourth proportional to 28,932, 39,926.40 and 15,684 is: 21,644.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,932 : 39,926.40 = 15,684 : x
  2. Step 2: Convert to fraction form
    28,932/39,926.40 = 15,684/x
  3. Step 3: Cross multiply
    28,932x = 39,926.40 × 15,684
  4. Step 4: Simplify right side
    28,932x = 626,205,657.60
  5. Step 5: Solve for x
    x = 626,205,657.60/28,932
  6. Step 6: Final answer
    x = 21,644.05

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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.