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Finding the Fourth Proportional to 113,391.70, 170,087.55 and 78,399.70

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Solution

The fourth proportional to 113,391.70, 170,087.55 and 78,399.70 is: 117,599.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    113,391.70 : 170,087.55 = 78,399.70 : x
  2. Step 2: Convert to fraction form
    113,391.70/170,087.55 = 78,399.70/x
  3. Step 3: Cross multiply
    113,391.70x = 170,087.55 × 78,399.70
  4. Step 4: Simplify right side
    113,391.70x = 13,334,812,893.74
  5. Step 5: Solve for x
    x = 13,334,812,893.74/113,391.70
  6. Step 6: Final answer
    x = 117,599.55

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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.