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Finding the Fourth Proportional to 1,238.39, 1,855.61 and 907.80

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Solution

The fourth proportional to 1,238.39, 1,855.61 and 907.80 is: 1,360.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.39 : 1,855.61 = 907.80 : x
  2. Step 2: Convert to fraction form
    1,238.39/1,855.61 = 907.80/x
  3. Step 3: Cross multiply
    1,238.39x = 1,855.61 × 907.80
  4. Step 4: Simplify right side
    1,238.39x = 1,684,518.22
  5. Step 5: Solve for x
    x = 1,684,518.22/1,238.39
  6. Step 6: Final answer
    x = 1,360.25

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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.