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Finding the Fourth Proportional to 8,587, 12,885.36 and 3,970

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Solution

The fourth proportional to 8,587, 12,885.36 and 3,970 is: 5,957.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,587 : 12,885.36 = 3,970 : x
  2. Step 2: Convert to fraction form
    8,587/12,885.36 = 3,970/x
  3. Step 3: Cross multiply
    8,587x = 12,885.36 × 3,970
  4. Step 4: Simplify right side
    8,587x = 51,154,879.20
  5. Step 5: Solve for x
    x = 51,154,879.20/8,587
  6. Step 6: Final answer
    x = 5,957.25

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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.