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Finding the Fourth Proportional to 2,985.35, 4,478.45 and 983.43

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Solution

The fourth proportional to 2,985.35, 4,478.45 and 983.43 is: 1,475.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,985.35 : 4,478.45 = 983.43 : x
  2. Step 2: Convert to fraction form
    2,985.35/4,478.45 = 983.43/x
  3. Step 3: Cross multiply
    2,985.35x = 4,478.45 × 983.43
  4. Step 4: Simplify right side
    2,985.35x = 4,404,237.17
  5. Step 5: Solve for x
    x = 4,404,237.17/2,985.35
  6. Step 6: Final answer
    x = 1,475.29

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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.