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Finding the Fourth Proportional to 113,853.20, 170,779.80 and 78,861.20

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Solution

The fourth proportional to 113,853.20, 170,779.80 and 78,861.20 is: 118,291.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    113,853.20 : 170,779.80 = 78,861.20 : x
  2. Step 2: Convert to fraction form
    113,853.20/170,779.80 = 78,861.20/x
  3. Step 3: Cross multiply
    113,853.20x = 170,779.80 × 78,861.20
  4. Step 4: Simplify right side
    113,853.20x = 13,467,899,963.76
  5. Step 5: Solve for x
    x = 13,467,899,963.76/113,853.20
  6. Step 6: Final answer
    x = 118,291.80

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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.