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Finding the Fourth Proportional to 929.79, 1,392.86 and 637.25

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Solution

The fourth proportional to 929.79, 1,392.86 and 637.25 is: 954.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.79 : 1,392.86 = 637.25 : x
  2. Step 2: Convert to fraction form
    929.79/1,392.86 = 637.25/x
  3. Step 3: Cross multiply
    929.79x = 1,392.86 × 637.25
  4. Step 4: Simplify right side
    929.79x = 887,594.66
  5. Step 5: Solve for x
    x = 887,594.66/929.79
  6. Step 6: Final answer
    x = 954.62

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.