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Finding the Fourth Proportional to 78,980.76, 108,993.67 and 47,148.98

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Solution

The fourth proportional to 78,980.76, 108,993.67 and 47,148.98 is: 65,065.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,980.76 : 108,993.67 = 47,148.98 : x
  2. Step 2: Convert to fraction form
    78,980.76/108,993.67 = 47,148.98/x
  3. Step 3: Cross multiply
    78,980.76x = 108,993.67 × 47,148.98
  4. Step 4: Simplify right side
    78,980.76x = 5,138,939,704.12
  5. Step 5: Solve for x
    x = 5,138,939,704.12/78,980.76
  6. Step 6: Final answer
    x = 65,065.72

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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.