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Finding the Fourth Proportional to 428,089.20, 591,160.20 and 320,472.40

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Solution

The fourth proportional to 428,089.20, 591,160.20 and 320,472.40 is: 442,549.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,089.20 : 591,160.20 = 320,472.40 : x
  2. Step 2: Convert to fraction form
    428,089.20/591,160.20 = 320,472.40/x
  3. Step 3: Cross multiply
    428,089.20x = 591,160.20 × 320,472.40
  4. Step 4: Simplify right side
    428,089.20x = 189,450,528,078.48
  5. Step 5: Solve for x
    x = 189,450,528,078.48/428,089.20
  6. Step 6: Final answer
    x = 442,549.19

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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.