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Finding the Fourth Proportional to 486,950.40, 671,889.60 and 285,638.40

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Solution

The fourth proportional to 486,950.40, 671,889.60 and 285,638.40 is: 394,121.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    486,950.40 : 671,889.60 = 285,638.40 : x
  2. Step 2: Convert to fraction form
    486,950.40/671,889.60 = 285,638.40/x
  3. Step 3: Cross multiply
    486,950.40x = 671,889.60 × 285,638.40
  4. Step 4: Simplify right side
    486,950.40x = 191,917,470,320.64
  5. Step 5: Solve for x
    x = 191,917,470,320.64/486,950.40
  6. Step 6: Final answer
    x = 394,121.19

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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.