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Finding the Fourth Proportional to 18,970.40, 28,461.98 and 8,447.59

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Solution

The fourth proportional to 18,970.40, 28,461.98 and 8,447.59 is: 12,674.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,970.40 : 28,461.98 = 8,447.59 : x
  2. Step 2: Convert to fraction form
    18,970.40/28,461.98 = 8,447.59/x
  3. Step 3: Cross multiply
    18,970.40x = 28,461.98 × 8,447.59
  4. Step 4: Simplify right side
    18,970.40x = 240,435,194.32
  5. Step 5: Solve for x
    x = 240,435,194.32/18,970.40
  6. Step 6: Final answer
    x = 12,674.23

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1.5x scale

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.