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Finding the Fourth Proportional to 663,624.12, 915,774.90 and 391,779.59

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Solution

The fourth proportional to 663,624.12, 915,774.90 and 391,779.59 is: 540,640.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,624.12 : 915,774.90 = 391,779.59 : x
  2. Step 2: Convert to fraction form
    663,624.12/915,774.90 = 391,779.59/x
  3. Step 3: Cross multiply
    663,624.12x = 915,774.90 × 391,779.59
  4. Step 4: Simplify right side
    663,624.12x = 358,781,910,275.42
  5. Step 5: Solve for x
    x = 358,781,910,275.42/663,624.12
  6. Step 6: Final answer
    x = 540,640.25

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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.