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Finding the Fourth Proportional to 512.64, 706.86 and 407.52

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Solution

The fourth proportional to 512.64, 706.86 and 407.52 is: 561.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.64 : 706.86 = 407.52 : x
  2. Step 2: Convert to fraction form
    512.64/706.86 = 407.52/x
  3. Step 3: Cross multiply
    512.64x = 706.86 × 407.52
  4. Step 4: Simplify right side
    512.64x = 288,059.59
  5. Step 5: Solve for x
    x = 288,059.59/512.64
  6. Step 6: Final answer
    x = 561.91

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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.