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Finding the Fourth Proportional to 666,390.40, 919,606.96 and 408,227.20

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Solution

The fourth proportional to 666,390.40, 919,606.96 and 408,227.20 is: 563,346.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,390.40 : 919,606.96 = 408,227.20 : x
  2. Step 2: Convert to fraction form
    666,390.40/919,606.96 = 408,227.20/x
  3. Step 3: Cross multiply
    666,390.40x = 919,606.96 × 408,227.20
  4. Step 4: Simplify right side
    666,390.40x = 375,408,574,381.31
  5. Step 5: Solve for x
    x = 375,408,574,381.31/666,390.40
  6. Step 6: Final answer
    x = 563,346.31

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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.