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Finding the Fourth Proportional to 685.81, 946.29 and 387.01

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Solution

The fourth proportional to 685.81, 946.29 and 387.01 is: 534.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.81 : 946.29 = 387.01 : x
  2. Step 2: Convert to fraction form
    685.81/946.29 = 387.01/x
  3. Step 3: Cross multiply
    685.81x = 946.29 × 387.01
  4. Step 4: Simplify right side
    685.81x = 366,223.69
  5. Step 5: Solve for x
    x = 366,223.69/685.81
  6. Step 6: Final answer
    x = 534.00

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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.