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Finding the Fourth Proportional to 2,148.99, 3,222.12 and 915.39

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Solution

The fourth proportional to 2,148.99, 3,222.12 and 915.39 is: 1,372.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,148.99 : 3,222.12 = 915.39 : x
  2. Step 2: Convert to fraction form
    2,148.99/3,222.12 = 915.39/x
  3. Step 3: Cross multiply
    2,148.99x = 3,222.12 × 915.39
  4. Step 4: Simplify right side
    2,148.99x = 2,949,496.43
  5. Step 5: Solve for x
    x = 2,949,496.43/2,148.99
  6. Step 6: Final answer
    x = 1,372.50

Related Problems

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Double scale
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1.5x scale

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.