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Finding the Fourth Proportional to 765.45, 1,146.62 and 354.02

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Solution

The fourth proportional to 765.45, 1,146.62 and 354.02 is: 530.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.45 : 1,146.62 = 354.02 : x
  2. Step 2: Convert to fraction form
    765.45/1,146.62 = 354.02/x
  3. Step 3: Cross multiply
    765.45x = 1,146.62 × 354.02
  4. Step 4: Simplify right side
    765.45x = 405,918.91
  5. Step 5: Solve for x
    x = 405,918.91/765.45
  6. Step 6: Final answer
    x = 530.30

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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.