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Finding the Fourth Proportional to 28,078.08, 38,748.04 and 15,502.80

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Solution

The fourth proportional to 28,078.08, 38,748.04 and 15,502.80 is: 21,394.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,078.08 : 38,748.04 = 15,502.80 : x
  2. Step 2: Convert to fraction form
    28,078.08/38,748.04 = 15,502.80/x
  3. Step 3: Cross multiply
    28,078.08x = 38,748.04 × 15,502.80
  4. Step 4: Simplify right side
    28,078.08x = 600,703,114.51
  5. Step 5: Solve for x
    x = 600,703,114.51/28,078.08
  6. Step 6: Final answer
    x = 21,394.02

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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.