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Finding the Fourth Proportional to 280,455.40, 420,828.90 and 122,699.80

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Solution

The fourth proportional to 280,455.40, 420,828.90 and 122,699.80 is: 184,113.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,455.40 : 420,828.90 = 122,699.80 : x
  2. Step 2: Convert to fraction form
    280,455.40/420,828.90 = 122,699.80/x
  3. Step 3: Cross multiply
    280,455.40x = 420,828.90 × 122,699.80
  4. Step 4: Simplify right side
    280,455.40x = 51,635,621,864.22
  5. Step 5: Solve for x
    x = 51,635,621,864.22/280,455.40
  6. Step 6: Final answer
    x = 184,113.49

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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.