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Finding the Fourth Proportional to 612,420.20, 918,659.10 and 191,709.80

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Solution

The fourth proportional to 612,420.20, 918,659.10 and 191,709.80 is: 287,573.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,420.20 : 918,659.10 = 191,709.80 : x
  2. Step 2: Convert to fraction form
    612,420.20/918,659.10 = 191,709.80/x
  3. Step 3: Cross multiply
    612,420.20x = 918,659.10 × 191,709.80
  4. Step 4: Simplify right side
    612,420.20x = 176,115,952,329.18
  5. Step 5: Solve for x
    x = 176,115,952,329.18/612,420.20
  6. Step 6: Final answer
    x = 287,573.72

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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.