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Finding the Fourth Proportional to 988.80, 1,483.16 and 339.56

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Solution

The fourth proportional to 988.80, 1,483.16 and 339.56 is: 509.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.80 : 1,483.16 = 339.56 : x
  2. Step 2: Convert to fraction form
    988.80/1,483.16 = 339.56/x
  3. Step 3: Cross multiply
    988.80x = 1,483.16 × 339.56
  4. Step 4: Simplify right side
    988.80x = 503,621.81
  5. Step 5: Solve for x
    x = 503,621.81/988.80
  6. Step 6: Final answer
    x = 509.33

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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.