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Finding the Fourth Proportional to 519, 716.28 and 312

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Solution

The fourth proportional to 519, 716.28 and 312 is: 430.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    519 : 716.28 = 312 : x
  2. Step 2: Convert to fraction form
    519/716.28 = 312/x
  3. Step 3: Cross multiply
    519x = 716.28 × 312
  4. Step 4: Simplify right side
    519x = 223,479.36
  5. Step 5: Solve for x
    x = 223,479.36/519
  6. Step 6: Final answer
    x = 430.60

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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.