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Finding the Fourth Proportional to 14,478.68, 19,980.54 and 8,513.78

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Solution

The fourth proportional to 14,478.68, 19,980.54 and 8,513.78 is: 11,748.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,478.68 : 19,980.54 = 8,513.78 : x
  2. Step 2: Convert to fraction form
    14,478.68/19,980.54 = 8,513.78/x
  3. Step 3: Cross multiply
    14,478.68x = 19,980.54 × 8,513.78
  4. Step 4: Simplify right side
    14,478.68x = 170,109,821.94
  5. Step 5: Solve for x
    x = 170,109,821.94/14,478.68
  6. Step 6: Final answer
    x = 11,748.98

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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.