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Finding the Fourth Proportional to 113,779.70, 170,669.55 and 78,350.30

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Solution

The fourth proportional to 113,779.70, 170,669.55 and 78,350.30 is: 117,525.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    113,779.70 : 170,669.55 = 78,350.30 : x
  2. Step 2: Convert to fraction form
    113,779.70/170,669.55 = 78,350.30/x
  3. Step 3: Cross multiply
    113,779.70x = 170,669.55 × 78,350.30
  4. Step 4: Simplify right side
    113,779.70x = 13,372,010,443.37
  5. Step 5: Solve for x
    x = 13,372,010,443.37/113,779.70
  6. Step 6: Final answer
    x = 117,525.45

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Similar ratio
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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.