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Finding the Fourth Proportional to 43,279, 64,918.50 and 10,447

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Solution

The fourth proportional to 43,279, 64,918.50 and 10,447 is: 15,670.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,279 : 64,918.50 = 10,447 : x
  2. Step 2: Convert to fraction form
    43,279/64,918.50 = 10,447/x
  3. Step 3: Cross multiply
    43,279x = 64,918.50 × 10,447
  4. Step 4: Simplify right side
    43,279x = 678,203,569.50
  5. Step 5: Solve for x
    x = 678,203,569.50/43,279
  6. Step 6: Final answer
    x = 15,670.50

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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.