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Finding the Fourth Proportional to 347.28, 522.80 and 312

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Solution

The fourth proportional to 347.28, 522.80 and 312 is: 469.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    347.28 : 522.80 = 312 : x
  2. Step 2: Convert to fraction form
    347.28/522.80 = 312/x
  3. Step 3: Cross multiply
    347.28x = 522.80 × 312
  4. Step 4: Simplify right side
    347.28x = 163,113.60
  5. Step 5: Solve for x
    x = 163,113.60/347.28
  6. Step 6: Final answer
    x = 469.69

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.