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Finding the Fourth Proportional to 654,515.40, 903,215.70 and 428,156.04

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Solution

The fourth proportional to 654,515.40, 903,215.70 and 428,156.04 is: 590,845.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    654,515.40 : 903,215.70 = 428,156.04 : x
  2. Step 2: Convert to fraction form
    654,515.40/903,215.70 = 428,156.04/x
  3. Step 3: Cross multiply
    654,515.40x = 903,215.70 × 428,156.04
  4. Step 4: Simplify right side
    654,515.40x = 386,717,257,377.83
  5. Step 5: Solve for x
    x = 386,717,257,377.83/654,515.40
  6. Step 6: Final answer
    x = 590,845.16

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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.