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Finding the Fourth Proportional to 78,572.08, 117,829.41 and 28,637.40

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Solution

The fourth proportional to 78,572.08, 117,829.41 and 28,637.40 is: 42,945.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,572.08 : 117,829.41 = 28,637.40 : x
  2. Step 2: Convert to fraction form
    78,572.08/117,829.41 = 28,637.40/x
  3. Step 3: Cross multiply
    78,572.08x = 117,829.41 × 28,637.40
  4. Step 4: Simplify right side
    78,572.08x = 3,374,327,698.16
  5. Step 5: Solve for x
    x = 3,374,327,698.16/78,572.08
  6. Step 6: Final answer
    x = 42,945.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.