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Finding the Fourth Proportional to 14,139, 21,208.54 and 4,905

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Solution

The fourth proportional to 14,139, 21,208.54 and 4,905 is: 7,357.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,139 : 21,208.54 = 4,905 : x
  2. Step 2: Convert to fraction form
    14,139/21,208.54 = 4,905/x
  3. Step 3: Cross multiply
    14,139x = 21,208.54 × 4,905
  4. Step 4: Simplify right side
    14,139x = 104,027,888.70
  5. Step 5: Solve for x
    x = 104,027,888.70/14,139
  6. Step 6: Final answer
    x = 7,357.51

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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.