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Finding the Fourth Proportional to 988.82, 1,483.36 and 339.38

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Solution

The fourth proportional to 988.82, 1,483.36 and 339.38 is: 509.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.82 : 1,483.36 = 339.38 : x
  2. Step 2: Convert to fraction form
    988.82/1,483.36 = 339.38/x
  3. Step 3: Cross multiply
    988.82x = 1,483.36 × 339.38
  4. Step 4: Simplify right side
    988.82x = 503,414.45
  5. Step 5: Solve for x
    x = 503,414.45/988.82
  6. Step 6: Final answer
    x = 509.11

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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.