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Finding the Fourth Proportional to 1,145.66, 1,718.91 and 415.28

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Solution

The fourth proportional to 1,145.66, 1,718.91 and 415.28 is: 623.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.66 : 1,718.91 = 415.28 : x
  2. Step 2: Convert to fraction form
    1,145.66/1,718.91 = 415.28/x
  3. Step 3: Cross multiply
    1,145.66x = 1,718.91 × 415.28
  4. Step 4: Simplify right side
    1,145.66x = 713,833.24
  5. Step 5: Solve for x
    x = 713,833.24/1,145.66
  6. Step 6: Final answer
    x = 623.08

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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.