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Finding the Fourth Proportional to 310,321.60, 428,232.32 and 189,664.64

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Solution

The fourth proportional to 310,321.60, 428,232.32 and 189,664.64 is: 261,730.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    310,321.60 : 428,232.32 = 189,664.64 : x
  2. Step 2: Convert to fraction form
    310,321.60/428,232.32 = 189,664.64/x
  3. Step 3: Cross multiply
    310,321.60x = 428,232.32 × 189,664.64
  4. Step 4: Simplify right side
    310,321.60x = 81,220,528,809.16
  5. Step 5: Solve for x
    x = 81,220,528,809.16/310,321.60
  6. Step 6: Final answer
    x = 261,730.18

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.