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Finding the Fourth Proportional to 1,728.08, 2,387.79 and 1,358

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Solution

The fourth proportional to 1,728.08, 2,387.79 and 1,358 is: 1,876.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,728.08 : 2,387.79 = 1,358 : x
  2. Step 2: Convert to fraction form
    1,728.08/2,387.79 = 1,358/x
  3. Step 3: Cross multiply
    1,728.08x = 2,387.79 × 1,358
  4. Step 4: Simplify right side
    1,728.08x = 3,242,618.82
  5. Step 5: Solve for x
    x = 3,242,618.82/1,728.08
  6. Step 6: Final answer
    x = 1,876.43

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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.