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Finding the Fourth Proportional to 1,039.20, 1,552.80 and 907.44

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Solution

The fourth proportional to 1,039.20, 1,552.80 and 907.44 is: 1,355.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.20 : 1,552.80 = 907.44 : x
  2. Step 2: Convert to fraction form
    1,039.20/1,552.80 = 907.44/x
  3. Step 3: Cross multiply
    1,039.20x = 1,552.80 × 907.44
  4. Step 4: Simplify right side
    1,039.20x = 1,409,072.83
  5. Step 5: Solve for x
    x = 1,409,072.83/1,039.20
  6. Step 6: Final answer
    x = 1,355.92

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.