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Finding the Fourth Proportional to 43,419, 65,128.50 and 10,587

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Solution

The fourth proportional to 43,419, 65,128.50 and 10,587 is: 15,880.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,419 : 65,128.50 = 10,587 : x
  2. Step 2: Convert to fraction form
    43,419/65,128.50 = 10,587/x
  3. Step 3: Cross multiply
    43,419x = 65,128.50 × 10,587
  4. Step 4: Simplify right side
    43,419x = 689,515,429.50
  5. Step 5: Solve for x
    x = 689,515,429.50/43,419
  6. Step 6: Final answer
    x = 15,880.50

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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.