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Finding the Fourth Proportional to 929.39, 1,394.69 and 442.49

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Solution

The fourth proportional to 929.39, 1,394.69 and 442.49 is: 664.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.39 : 1,394.69 = 442.49 : x
  2. Step 2: Convert to fraction form
    929.39/1,394.69 = 442.49/x
  3. Step 3: Cross multiply
    929.39x = 1,394.69 × 442.49
  4. Step 4: Simplify right side
    929.39x = 617,127.19
  5. Step 5: Solve for x
    x = 617,127.19/929.39
  6. Step 6: Final answer
    x = 664.02

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Double scale
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1.5x scale

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.