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Finding the Fourth Proportional to 994.78, 1,492.17 and 345.67

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Solution

The fourth proportional to 994.78, 1,492.17 and 345.67 is: 518.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.78 : 1,492.17 = 345.67 : x
  2. Step 2: Convert to fraction form
    994.78/1,492.17 = 345.67/x
  3. Step 3: Cross multiply
    994.78x = 1,492.17 × 345.67
  4. Step 4: Simplify right side
    994.78x = 515,795.32
  5. Step 5: Solve for x
    x = 515,795.32/994.78
  6. Step 6: Final answer
    x = 518.50

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Half scale
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Double scale
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Similar ratio
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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.