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Finding the Fourth Proportional to 681.66, 940.74 and 386.91

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Solution

The fourth proportional to 681.66, 940.74 and 386.91 is: 533.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.66 : 940.74 = 386.91 : x
  2. Step 2: Convert to fraction form
    681.66/940.74 = 386.91/x
  3. Step 3: Cross multiply
    681.66x = 940.74 × 386.91
  4. Step 4: Simplify right side
    681.66x = 363,981.71
  5. Step 5: Solve for x
    x = 363,981.71/681.66
  6. Step 6: Final answer
    x = 533.96

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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.