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Finding the Fourth Proportional to 280,903.40, 421,355.10 and 81,230.30

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Solution

The fourth proportional to 280,903.40, 421,355.10 and 81,230.30 is: 121,845.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,903.40 : 421,355.10 = 81,230.30 : x
  2. Step 2: Convert to fraction form
    280,903.40/421,355.10 = 81,230.30/x
  3. Step 3: Cross multiply
    280,903.40x = 421,355.10 × 81,230.30
  4. Step 4: Simplify right side
    280,903.40x = 34,226,801,179.53
  5. Step 5: Solve for x
    x = 34,226,801,179.53/280,903.40
  6. Step 6: Final answer
    x = 121,845.45

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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.