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Finding the Fourth Proportional to 621,811.60, 931,405.20 and 555,326.80

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Solution

The fourth proportional to 621,811.60, 931,405.20 and 555,326.80 is: 831,818.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,811.60 : 931,405.20 = 555,326.80 : x
  2. Step 2: Convert to fraction form
    621,811.60/931,405.20 = 555,326.80/x
  3. Step 3: Cross multiply
    621,811.60x = 931,405.20 × 555,326.80
  4. Step 4: Simplify right side
    621,811.60x = 517,234,269,219.36
  5. Step 5: Solve for x
    x = 517,234,269,219.36/621,811.60
  6. Step 6: Final answer
    x = 831,818.30

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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.