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Finding the Fourth Proportional to 988.96, 1,483.20 and 339.68

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Solution

The fourth proportional to 988.96, 1,483.20 and 339.68 is: 509.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.96 : 1,483.20 = 339.68 : x
  2. Step 2: Convert to fraction form
    988.96/1,483.20 = 339.68/x
  3. Step 3: Cross multiply
    988.96x = 1,483.20 × 339.68
  4. Step 4: Simplify right side
    988.96x = 503,813.38
  5. Step 5: Solve for x
    x = 503,813.38/988.96
  6. Step 6: Final answer
    x = 509.44

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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.