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Finding the Fourth Proportional to 2,213, 3,317.68 and 915.40

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Solution

The fourth proportional to 2,213, 3,317.68 and 915.40 is: 1,372.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,213 : 3,317.68 = 915.40 : x
  2. Step 2: Convert to fraction form
    2,213/3,317.68 = 915.40/x
  3. Step 3: Cross multiply
    2,213x = 3,317.68 × 915.40
  4. Step 4: Simplify right side
    2,213x = 3,037,004.27
  5. Step 5: Solve for x
    x = 3,037,004.27/2,213
  6. Step 6: Final answer
    x = 1,372.35

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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.