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Finding the Fourth Proportional to 280,638.96, 387,299.58 and 159,790.80

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Solution

The fourth proportional to 280,638.96, 387,299.58 and 159,790.80 is: 220,521.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,638.96 : 387,299.58 = 159,790.80 : x
  2. Step 2: Convert to fraction form
    280,638.96/387,299.58 = 159,790.80/x
  3. Step 3: Cross multiply
    280,638.96x = 387,299.58 × 159,790.80
  4. Step 4: Simplify right side
    280,638.96x = 61,886,909,727.86
  5. Step 5: Solve for x
    x = 61,886,909,727.86/280,638.96
  6. Step 6: Final answer
    x = 220,521.45

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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.