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Finding the Fourth Proportional to 28,411.68, 39,209.04 and 15,835.68

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Solution

The fourth proportional to 28,411.68, 39,209.04 and 15,835.68 is: 21,853.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,411.68 : 39,209.04 = 15,835.68 : x
  2. Step 2: Convert to fraction form
    28,411.68/39,209.04 = 15,835.68/x
  3. Step 3: Cross multiply
    28,411.68x = 39,209.04 × 15,835.68
  4. Step 4: Simplify right side
    28,411.68x = 620,901,810.55
  5. Step 5: Solve for x
    x = 620,901,810.55/28,411.68
  6. Step 6: Final answer
    x = 21,853.75

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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.