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Finding the Fourth Proportional to 10,587, 15,880.50 and 4,431

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Solution

The fourth proportional to 10,587, 15,880.50 and 4,431 is: 6,646.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,587 : 15,880.50 = 4,431 : x
  2. Step 2: Convert to fraction form
    10,587/15,880.50 = 4,431/x
  3. Step 3: Cross multiply
    10,587x = 15,880.50 × 4,431
  4. Step 4: Simplify right side
    10,587x = 70,366,495.50
  5. Step 5: Solve for x
    x = 70,366,495.50/10,587
  6. Step 6: Final answer
    x = 6,646.50

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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.