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Finding the Fourth Proportional to 681.48, 940.47 and 386.76

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Solution

The fourth proportional to 681.48, 940.47 and 386.76 is: 533.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.48 : 940.47 = 386.76 : x
  2. Step 2: Convert to fraction form
    681.48/940.47 = 386.76/x
  3. Step 3: Cross multiply
    681.48x = 940.47 × 386.76
  4. Step 4: Simplify right side
    681.48x = 363,736.18
  5. Step 5: Solve for x
    x = 363,736.18/681.48
  6. Step 6: Final answer
    x = 533.74

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Half scale
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Double scale
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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.