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Finding the Fourth Proportional to 621,813.60, 931,408.20 and 555,328.80

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Solution

The fourth proportional to 621,813.60, 931,408.20 and 555,328.80 is: 831,821.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,813.60 : 931,408.20 = 555,328.80 : x
  2. Step 2: Convert to fraction form
    621,813.60/931,408.20 = 555,328.80/x
  3. Step 3: Cross multiply
    621,813.60x = 931,408.20 × 555,328.80
  4. Step 4: Simplify right side
    621,813.60x = 517,237,798,016.16
  5. Step 5: Solve for x
    x = 517,237,798,016.16/621,813.60
  6. Step 6: Final answer
    x = 831,821.30

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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.