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Finding the Fourth Proportional to 685.67, 946.06 and 405.89

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Solution

The fourth proportional to 685.67, 946.06 and 405.89 is: 560.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.67 : 946.06 = 405.89 : x
  2. Step 2: Convert to fraction form
    685.67/946.06 = 405.89/x
  3. Step 3: Cross multiply
    685.67x = 946.06 × 405.89
  4. Step 4: Simplify right side
    685.67x = 383,996.29
  5. Step 5: Solve for x
    x = 383,996.29/685.67
  6. Step 6: Final answer
    x = 560.03

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1.5x scale

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.