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Finding the Fourth Proportional to 988.64, 1,483.56 and 411.50

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Solution

The fourth proportional to 988.64, 1,483.56 and 411.50 is: 617.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.64 : 1,483.56 = 411.50 : x
  2. Step 2: Convert to fraction form
    988.64/1,483.56 = 411.50/x
  3. Step 3: Cross multiply
    988.64x = 1,483.56 × 411.50
  4. Step 4: Simplify right side
    988.64x = 610,484.94
  5. Step 5: Solve for x
    x = 610,484.94/988.64
  6. Step 6: Final answer
    x = 617.50

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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.