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Finding the Fourth Proportional to 763.61, 1,145.61 and 330.80

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Solution

The fourth proportional to 763.61, 1,145.61 and 330.80 is: 496.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.61 : 1,145.61 = 330.80 : x
  2. Step 2: Convert to fraction form
    763.61/1,145.61 = 330.80/x
  3. Step 3: Cross multiply
    763.61x = 1,145.61 × 330.80
  4. Step 4: Simplify right side
    763.61x = 378,962.06
  5. Step 5: Solve for x
    x = 378,962.06/763.61
  6. Step 6: Final answer
    x = 496.28

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1.5x scale

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.