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Finding the Fourth Proportional to 12,915.70, 19,373.80 and 3,555.67

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Solution

The fourth proportional to 12,915.70, 19,373.80 and 3,555.67 is: 5,333.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,915.70 : 19,373.80 = 3,555.67 : x
  2. Step 2: Convert to fraction form
    12,915.70/19,373.80 = 3,555.67/x
  3. Step 3: Cross multiply
    12,915.70x = 19,373.80 × 3,555.67
  4. Step 4: Simplify right side
    12,915.70x = 68,886,839.45
  5. Step 5: Solve for x
    x = 68,886,839.45/12,915.70
  6. Step 6: Final answer
    x = 5,333.57

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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.