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Finding the Fourth Proportional to 768,422.79, 1,060,380.32 and 428,912.91

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Solution

The fourth proportional to 768,422.79, 1,060,380.32 and 428,912.91 is: 591,875.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    768,422.79 : 1,060,380.32 = 428,912.91 : x
  2. Step 2: Convert to fraction form
    768,422.79/1,060,380.32 = 428,912.91/x
  3. Step 3: Cross multiply
    768,422.79x = 1,060,380.32 × 428,912.91
  4. Step 4: Simplify right side
    768,422.79x = 454,810,806,613.37
  5. Step 5: Solve for x
    x = 454,810,806,613.37/768,422.79
  6. Step 6: Final answer
    x = 591,875.74

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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.