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Finding the Fourth Proportional to 103,085.70, 154,628.55 and 79,728.90

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Solution

The fourth proportional to 103,085.70, 154,628.55 and 79,728.90 is: 119,593.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,085.70 : 154,628.55 = 79,728.90 : x
  2. Step 2: Convert to fraction form
    103,085.70/154,628.55 = 79,728.90/x
  3. Step 3: Cross multiply
    103,085.70x = 154,628.55 × 79,728.90
  4. Step 4: Simplify right side
    103,085.70x = 12,328,364,200.10
  5. Step 5: Solve for x
    x = 12,328,364,200.10/103,085.70
  6. Step 6: Final answer
    x = 119,593.35

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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.