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Finding the Fourth Proportional to 280,639.45, 387,300.29 and 159,791.30

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Solution

The fourth proportional to 280,639.45, 387,300.29 and 159,791.30 is: 220,522.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,639.45 : 387,300.29 = 159,791.30 : x
  2. Step 2: Convert to fraction form
    280,639.45/387,300.29 = 159,791.30/x
  3. Step 3: Cross multiply
    280,639.45x = 387,300.29 × 159,791.30
  4. Step 4: Simplify right side
    280,639.45x = 61,887,214,094.02
  5. Step 5: Solve for x
    x = 61,887,214,094.02/280,639.45
  6. Step 6: Final answer
    x = 220,522.15

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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.