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Finding the Fourth Proportional to 145,908.70, 218,863.05 and 128,412.70

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Solution

The fourth proportional to 145,908.70, 218,863.05 and 128,412.70 is: 192,619.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,908.70 : 218,863.05 = 128,412.70 : x
  2. Step 2: Convert to fraction form
    145,908.70/218,863.05 = 128,412.70/x
  3. Step 3: Cross multiply
    145,908.70x = 218,863.05 × 128,412.70
  4. Step 4: Simplify right side
    145,908.70x = 28,104,795,180.74
  5. Step 5: Solve for x
    x = 28,104,795,180.74/145,908.70
  6. Step 6: Final answer
    x = 192,619.05

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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.