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Finding the Fourth Proportional to 280,638.66, 387,238.64 and 159,785.04

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Solution

The fourth proportional to 280,638.66, 387,238.64 and 159,785.04 is: 220,479.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,638.66 : 387,238.64 = 159,785.04 : x
  2. Step 2: Convert to fraction form
    280,638.66/387,238.64 = 159,785.04/x
  3. Step 3: Cross multiply
    280,638.66x = 387,238.64 × 159,785.04
  4. Step 4: Simplify right side
    280,638.66x = 61,874,941,581.95
  5. Step 5: Solve for x
    x = 61,874,941,581.95/280,638.66
  6. Step 6: Final answer
    x = 220,479.04

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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.