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Finding the Fourth Proportional to 19,131.70, 28,699.19 and 5,280.70

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Solution

The fourth proportional to 19,131.70, 28,699.19 and 5,280.70 is: 7,921.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,131.70 : 28,699.19 = 5,280.70 : x
  2. Step 2: Convert to fraction form
    19,131.70/28,699.19 = 5,280.70/x
  3. Step 3: Cross multiply
    19,131.70x = 28,699.19 × 5,280.70
  4. Step 4: Simplify right side
    19,131.70x = 151,551,812.63
  5. Step 5: Solve for x
    x = 151,551,812.63/19,131.70
  6. Step 6: Final answer
    x = 7,921.50

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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.