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Finding the Fourth Proportional to 611,590.20, 917,385.30 and 517,111.80

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Solution

The fourth proportional to 611,590.20, 917,385.30 and 517,111.80 is: 775,667.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,590.20 : 917,385.30 = 517,111.80 : x
  2. Step 2: Convert to fraction form
    611,590.20/917,385.30 = 517,111.80/x
  3. Step 3: Cross multiply
    611,590.20x = 917,385.30 × 517,111.80
  4. Step 4: Simplify right side
    611,590.20x = 474,390,763,776.54
  5. Step 5: Solve for x
    x = 474,390,763,776.54/611,590.20
  6. Step 6: Final answer
    x = 775,667.70

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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.