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Finding the Fourth Proportional to 686.46, 946.35 and 511.50

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Solution

The fourth proportional to 686.46, 946.35 and 511.50 is: 705.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.46 : 946.35 = 511.50 : x
  2. Step 2: Convert to fraction form
    686.46/946.35 = 511.50/x
  3. Step 3: Cross multiply
    686.46x = 946.35 × 511.50
  4. Step 4: Simplify right side
    686.46x = 484,058.03
  5. Step 5: Solve for x
    x = 484,058.03/686.46
  6. Step 6: Final answer
    x = 705.15

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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.