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Finding the Fourth Proportional to 78,379.52, 117,567.65 and 19,215.50

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Solution

The fourth proportional to 78,379.52, 117,567.65 and 19,215.50 is: 28,822.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,379.52 : 117,567.65 = 19,215.50 : x
  2. Step 2: Convert to fraction form
    78,379.52/117,567.65 = 19,215.50/x
  3. Step 3: Cross multiply
    78,379.52x = 117,567.65 × 19,215.50
  4. Step 4: Simplify right side
    78,379.52x = 2,259,120,638.78
  5. Step 5: Solve for x
    x = 2,259,120,638.78/78,379.52
  6. Step 6: Final answer
    x = 28,822.85

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1.5x scale

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.