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Finding the Fourth Proportional to 19,140, 28,710 and 5,289

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Solution

The fourth proportional to 19,140, 28,710 and 5,289 is: 7,933.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,140 : 28,710 = 5,289 : x
  2. Step 2: Convert to fraction form
    19,140/28,710 = 5,289/x
  3. Step 3: Cross multiply
    19,140x = 28,710 × 5,289
  4. Step 4: Simplify right side
    19,140x = 151,847,190
  5. Step 5: Solve for x
    x = 151,847,190/19,140
  6. Step 6: Final answer
    x = 7,933.50

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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.