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Finding the Fourth Proportional to 280,671.89, 387,327.21 and 153,348.40

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Solution

The fourth proportional to 280,671.89, 387,327.21 and 153,348.40 is: 211,620.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,671.89 : 387,327.21 = 153,348.40 : x
  2. Step 2: Convert to fraction form
    280,671.89/387,327.21 = 153,348.40/x
  3. Step 3: Cross multiply
    280,671.89x = 387,327.21 × 153,348.40
  4. Step 4: Simplify right side
    280,671.89x = 59,396,006,522.94
  5. Step 5: Solve for x
    x = 59,396,006,522.94/280,671.89
  6. Step 6: Final answer
    x = 211,620.79

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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.