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Finding the Fourth Proportional to 11,398.50, 15,729.95 and 6,430.50

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Solution

The fourth proportional to 11,398.50, 15,729.95 and 6,430.50 is: 8,874.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,398.50 : 15,729.95 = 6,430.50 : x
  2. Step 2: Convert to fraction form
    11,398.50/15,729.95 = 6,430.50/x
  3. Step 3: Cross multiply
    11,398.50x = 15,729.95 × 6,430.50
  4. Step 4: Simplify right side
    11,398.50x = 101,151,443.48
  5. Step 5: Solve for x
    x = 101,151,443.48/11,398.50
  6. Step 6: Final answer
    x = 8,874.10

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.