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Finding the Fourth Proportional to 686.57, 946.53 and 489.74

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Solution

The fourth proportional to 686.57, 946.53 and 489.74 is: 675.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.57 : 946.53 = 489.74 : x
  2. Step 2: Convert to fraction form
    686.57/946.53 = 489.74/x
  3. Step 3: Cross multiply
    686.57x = 946.53 × 489.74
  4. Step 4: Simplify right side
    686.57x = 463,548.87
  5. Step 5: Solve for x
    x = 463,548.87/686.57
  6. Step 6: Final answer
    x = 675.17

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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.