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Finding the Fourth Proportional to 929.54, 1,282.70 and 681.91

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Solution

The fourth proportional to 929.54, 1,282.70 and 681.91 is: 940.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.54 : 1,282.70 = 681.91 : x
  2. Step 2: Convert to fraction form
    929.54/1,282.70 = 681.91/x
  3. Step 3: Cross multiply
    929.54x = 1,282.70 × 681.91
  4. Step 4: Simplify right side
    929.54x = 874,684.46
  5. Step 5: Solve for x
    x = 874,684.46/929.54
  6. Step 6: Final answer
    x = 940.98

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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.