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Finding the Fourth Proportional to 280,712.57, 387,392.90 and 153,396.36

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Solution

The fourth proportional to 280,712.57, 387,392.90 and 153,396.36 is: 211,692.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,712.57 : 387,392.90 = 153,396.36 : x
  2. Step 2: Convert to fraction form
    280,712.57/387,392.90 = 153,396.36/x
  3. Step 3: Cross multiply
    280,712.57x = 387,392.90 × 153,396.36
  4. Step 4: Simplify right side
    280,712.57x = 59,424,659,982.86
  5. Step 5: Solve for x
    x = 59,424,659,982.86/280,712.57
  6. Step 6: Final answer
    x = 211,692.20

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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.