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Finding the Fourth Proportional to 11,423, 15,764.28 and 6,455

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Solution

The fourth proportional to 11,423, 15,764.28 and 6,455 is: 8,908.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,423 : 15,764.28 = 6,455 : x
  2. Step 2: Convert to fraction form
    11,423/15,764.28 = 6,455/x
  3. Step 3: Cross multiply
    11,423x = 15,764.28 × 6,455
  4. Step 4: Simplify right side
    11,423x = 101,758,427.40
  5. Step 5: Solve for x
    x = 101,758,427.40/11,423
  6. Step 6: Final answer
    x = 8,908.21

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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.