Home / 217,147.60-325,612.05-128,428.30

Finding the Fourth Proportional to 217,147.60, 325,612.05 and 128,428.30

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Solution

The fourth proportional to 217,147.60, 325,612.05 and 128,428.30 is: 192,577.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,147.60 : 325,612.05 = 128,428.30 : x
  2. Step 2: Convert to fraction form
    217,147.60/325,612.05 = 128,428.30/x
  3. Step 3: Cross multiply
    217,147.60x = 325,612.05 × 128,428.30
  4. Step 4: Simplify right side
    217,147.60x = 41,817,802,041.02
  5. Step 5: Solve for x
    x = 41,817,802,041.02/217,147.60
  6. Step 6: Final answer
    x = 192,577.78

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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.