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Finding the Fourth Proportional to 18,970.63, 28,455.93 and 4,929.48

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Solution

The fourth proportional to 18,970.63, 28,455.93 and 4,929.48 is: 7,394.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,970.63 : 28,455.93 = 4,929.48 : x
  2. Step 2: Convert to fraction form
    18,970.63/28,455.93 = 4,929.48/x
  3. Step 3: Cross multiply
    18,970.63x = 28,455.93 × 4,929.48
  4. Step 4: Simplify right side
    18,970.63x = 140,272,937.82
  5. Step 5: Solve for x
    x = 140,272,937.82/18,970.63
  6. Step 6: Final answer
    x = 7,394.22

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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.