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Finding the Fourth Proportional to 1,339.80, 2,009.70 and 415.35

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Solution

The fourth proportional to 1,339.80, 2,009.70 and 415.35 is: 623.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,339.80 : 2,009.70 = 415.35 : x
  2. Step 2: Convert to fraction form
    1,339.80/2,009.70 = 415.35/x
  3. Step 3: Cross multiply
    1,339.80x = 2,009.70 × 415.35
  4. Step 4: Simplify right side
    1,339.80x = 834,728.90
  5. Step 5: Solve for x
    x = 834,728.90/1,339.80
  6. Step 6: Final answer
    x = 623.03

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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.