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Finding the Fourth Proportional to 1,145.21, 1,717.20 and 365

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Solution

The fourth proportional to 1,145.21, 1,717.20 and 365 is: 547.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.21 : 1,717.20 = 365 : x
  2. Step 2: Convert to fraction form
    1,145.21/1,717.20 = 365/x
  3. Step 3: Cross multiply
    1,145.21x = 1,717.20 × 365
  4. Step 4: Simplify right side
    1,145.21x = 626,778
  5. Step 5: Solve for x
    x = 626,778/1,145.21
  6. Step 6: Final answer
    x = 547.30

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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.