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Finding the Fourth Proportional to 280,354.92, 420,101.88 and 190,280.64

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Solution

The fourth proportional to 280,354.92, 420,101.88 and 190,280.64 is: 285,128.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,354.92 : 420,101.88 = 190,280.64 : x
  2. Step 2: Convert to fraction form
    280,354.92/420,101.88 = 190,280.64/x
  3. Step 3: Cross multiply
    280,354.92x = 420,101.88 × 190,280.64
  4. Step 4: Simplify right side
    280,354.92x = 79,937,254,591.60
  5. Step 5: Solve for x
    x = 79,937,254,591.60/280,354.92
  6. Step 6: Final answer
    x = 285,128.77

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.