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Finding the Fourth Proportional to 5,319.19, 7,978.89 and 1,423.56

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Solution

The fourth proportional to 5,319.19, 7,978.89 and 1,423.56 is: 2,135.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,319.19 : 7,978.89 = 1,423.56 : x
  2. Step 2: Convert to fraction form
    5,319.19/7,978.89 = 1,423.56/x
  3. Step 3: Cross multiply
    5,319.19x = 7,978.89 × 1,423.56
  4. Step 4: Simplify right side
    5,319.19x = 11,358,428.65
  5. Step 5: Solve for x
    x = 11,358,428.65/5,319.19
  6. Step 6: Final answer
    x = 2,135.37

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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.