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Finding the Fourth Proportional to 1,385.65, 1,907.79 and 1,175.35

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Solution

The fourth proportional to 1,385.65, 1,907.79 and 1,175.35 is: 1,618.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.65 : 1,907.79 = 1,175.35 : x
  2. Step 2: Convert to fraction form
    1,385.65/1,907.79 = 1,175.35/x
  3. Step 3: Cross multiply
    1,385.65x = 1,907.79 × 1,175.35
  4. Step 4: Simplify right side
    1,385.65x = 2,242,320.98
  5. Step 5: Solve for x
    x = 2,242,320.98/1,385.65
  6. Step 6: Final answer
    x = 1,618.24

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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.