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Finding the Fourth Proportional to 15,683.80, 21,644 and 8,970.04

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Solution

The fourth proportional to 15,683.80, 21,644 and 8,970.04 is: 12,378.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,683.80 : 21,644 = 8,970.04 : x
  2. Step 2: Convert to fraction form
    15,683.80/21,644 = 8,970.04/x
  3. Step 3: Cross multiply
    15,683.80x = 21,644 × 8,970.04
  4. Step 4: Simplify right side
    15,683.80x = 194,147,545.76
  5. Step 5: Solve for x
    x = 194,147,545.76/15,683.80
  6. Step 6: Final answer
    x = 12,378.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.