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Finding the Fourth Proportional to 19,328.55, 28,983.69 and 7,487.87

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Solution

The fourth proportional to 19,328.55, 28,983.69 and 7,487.87 is: 11,228.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,328.55 : 28,983.69 = 7,487.87 : x
  2. Step 2: Convert to fraction form
    19,328.55/28,983.69 = 7,487.87/x
  3. Step 3: Cross multiply
    19,328.55x = 28,983.69 × 7,487.87
  4. Step 4: Simplify right side
    19,328.55x = 217,026,065.40
  5. Step 5: Solve for x
    x = 217,026,065.40/19,328.55
  6. Step 6: Final answer
    x = 11,228.26

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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.