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Finding the Fourth Proportional to 443.30, 611.02 and 312.08

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Solution

The fourth proportional to 443.30, 611.02 and 312.08 is: 430.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.30 : 611.02 = 312.08 : x
  2. Step 2: Convert to fraction form
    443.30/611.02 = 312.08/x
  3. Step 3: Cross multiply
    443.30x = 611.02 × 312.08
  4. Step 4: Simplify right side
    443.30x = 190,687.12
  5. Step 5: Solve for x
    x = 190,687.12/443.30
  6. Step 6: Final answer
    x = 430.15

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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.