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Finding the Fourth Proportional to 115,913.70, 173,870.55 and 87,920.10

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Solution

The fourth proportional to 115,913.70, 173,870.55 and 87,920.10 is: 131,880.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,913.70 : 173,870.55 = 87,920.10 : x
  2. Step 2: Convert to fraction form
    115,913.70/173,870.55 = 87,920.10/x
  3. Step 3: Cross multiply
    115,913.70x = 173,870.55 × 87,920.10
  4. Step 4: Simplify right side
    115,913.70x = 15,286,716,143.06
  5. Step 5: Solve for x
    x = 15,286,716,143.06/115,913.70
  6. Step 6: Final answer
    x = 131,880.15

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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.