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Finding the Fourth Proportional to 929.64, 1,284.06 and 680.58

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Solution

The fourth proportional to 929.64, 1,284.06 and 680.58 is: 940.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.64 : 1,284.06 = 680.58 : x
  2. Step 2: Convert to fraction form
    929.64/1,284.06 = 680.58/x
  3. Step 3: Cross multiply
    929.64x = 1,284.06 × 680.58
  4. Step 4: Simplify right side
    929.64x = 873,905.55
  5. Step 5: Solve for x
    x = 873,905.55/929.64
  6. Step 6: Final answer
    x = 940.05

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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.