Home / 663,623.97-915,774.70-391,779.45

Finding the Fourth Proportional to 663,623.97, 915,774.70 and 391,779.45

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Solution

The fourth proportional to 663,623.97, 915,774.70 and 391,779.45 is: 540,640.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,623.97 : 915,774.70 = 391,779.45 : x
  2. Step 2: Convert to fraction form
    663,623.97/915,774.70 = 391,779.45/x
  3. Step 3: Cross multiply
    663,623.97x = 915,774.70 × 391,779.45
  4. Step 4: Simplify right side
    663,623.97x = 358,781,708,289.92
  5. Step 5: Solve for x
    x = 358,781,708,289.92/663,623.97
  6. Step 6: Final answer
    x = 540,640.07

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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.