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Finding the Fourth Proportional to 486,951.40, 671,890.98 and 285,639.40

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Solution

The fourth proportional to 486,951.40, 671,890.98 and 285,639.40 is: 394,122.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    486,951.40 : 671,890.98 = 285,639.40 : x
  2. Step 2: Convert to fraction form
    486,951.40/671,890.98 = 285,639.40/x
  3. Step 3: Cross multiply
    486,951.40x = 671,890.98 × 285,639.40
  4. Step 4: Simplify right side
    486,951.40x = 191,918,536,392.61
  5. Step 5: Solve for x
    x = 191,918,536,392.61/486,951.40
  6. Step 6: Final answer
    x = 394,122.57

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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.