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Finding the Fourth Proportional to 28,317.90, 39,078.90 and 15,742.74

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Solution

The fourth proportional to 28,317.90, 39,078.90 and 15,742.74 is: 21,725.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,317.90 : 39,078.90 = 15,742.74 : x
  2. Step 2: Convert to fraction form
    28,317.90/39,078.90 = 15,742.74/x
  3. Step 3: Cross multiply
    28,317.90x = 39,078.90 × 15,742.74
  4. Step 4: Simplify right side
    28,317.90x = 615,208,962.19
  5. Step 5: Solve for x
    x = 615,208,962.19/28,317.90
  6. Step 6: Final answer
    x = 21,725.09

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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.