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Finding the Fourth Proportional to 520,111.40, 778,854.90 and 415,135.40

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Solution

The fourth proportional to 520,111.40, 778,854.90 and 415,135.40 is: 621,655.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,111.40 : 778,854.90 = 415,135.40 : x
  2. Step 2: Convert to fraction form
    520,111.40/778,854.90 = 415,135.40/x
  3. Step 3: Cross multiply
    520,111.40x = 778,854.90 × 415,135.40
  4. Step 4: Simplify right side
    520,111.40x = 323,330,240,453.46
  5. Step 5: Solve for x
    x = 323,330,240,453.46/520,111.40
  6. Step 6: Final answer
    x = 621,655.75

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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.