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Finding the Fourth Proportional to 130,389.44, 179,931.16 and 80,078.72

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Solution

The fourth proportional to 130,389.44, 179,931.16 and 80,078.72 is: 110,504.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    130,389.44 : 179,931.16 = 80,078.72 : x
  2. Step 2: Convert to fraction form
    130,389.44/179,931.16 = 80,078.72/x
  3. Step 3: Cross multiply
    130,389.44x = 179,931.16 × 80,078.72
  4. Step 4: Simplify right side
    130,389.44x = 14,408,656,980.92
  5. Step 5: Solve for x
    x = 14,408,656,980.92/130,389.44
  6. Step 6: Final answer
    x = 110,504.78

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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.