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Finding the Fourth Proportional to 18,715.50, 28,080.54 and 7,029.63

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Solution

The fourth proportional to 18,715.50, 28,080.54 and 7,029.63 is: 10,547.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,715.50 : 28,080.54 = 7,029.63 : x
  2. Step 2: Convert to fraction form
    18,715.50/28,080.54 = 7,029.63/x
  3. Step 3: Cross multiply
    18,715.50x = 28,080.54 × 7,029.63
  4. Step 4: Simplify right side
    18,715.50x = 197,395,806.40
  5. Step 5: Solve for x
    x = 197,395,806.40/18,715.50
  6. Step 6: Final answer
    x = 10,547.18

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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.