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Finding the Fourth Proportional to 1,560, 2,153.04 and 939.36

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Solution

The fourth proportional to 1,560, 2,153.04 and 939.36 is: 1,296.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,560 : 2,153.04 = 939.36 : x
  2. Step 2: Convert to fraction form
    1,560/2,153.04 = 939.36/x
  3. Step 3: Cross multiply
    1,560x = 2,153.04 × 939.36
  4. Step 4: Simplify right side
    1,560x = 2,022,479.65
  5. Step 5: Solve for x
    x = 2,022,479.65/1,560
  6. Step 6: Final answer
    x = 1,296.46

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.