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Finding the Fourth Proportional to 840.04, 1,260.04 and 455.20

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Solution

The fourth proportional to 840.04, 1,260.04 and 455.20 is: 682.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.04 : 1,260.04 = 455.20 : x
  2. Step 2: Convert to fraction form
    840.04/1,260.04 = 455.20/x
  3. Step 3: Cross multiply
    840.04x = 1,260.04 × 455.20
  4. Step 4: Simplify right side
    840.04x = 573,570.21
  5. Step 5: Solve for x
    x = 573,570.21/840.04
  6. Step 6: Final answer
    x = 682.79

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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.