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Finding the Fourth Proportional to 122,690.80, 183,140.80 and 105,272.56

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Solution

The fourth proportional to 122,690.80, 183,140.80 and 105,272.56 is: 157,140.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,690.80 : 183,140.80 = 105,272.56 : x
  2. Step 2: Convert to fraction form
    122,690.80/183,140.80 = 105,272.56/x
  3. Step 3: Cross multiply
    122,690.80x = 183,140.80 × 105,272.56
  4. Step 4: Simplify right side
    122,690.80x = 19,279,700,856.45
  5. Step 5: Solve for x
    x = 19,279,700,856.45/122,690.80
  6. Step 6: Final answer
    x = 157,140.56

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.