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Finding the Fourth Proportional to 443.04, 611.64 and 312

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Solution

The fourth proportional to 443.04, 611.64 and 312 is: 430.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.04 : 611.64 = 312 : x
  2. Step 2: Convert to fraction form
    443.04/611.64 = 312/x
  3. Step 3: Cross multiply
    443.04x = 611.64 × 312
  4. Step 4: Simplify right side
    443.04x = 190,831.68
  5. Step 5: Solve for x
    x = 190,831.68/443.04
  6. Step 6: Final answer
    x = 430.73

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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.