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Finding the Fourth Proportional to 18,689.80, 28,038.72 and 5,543.08

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Solution

The fourth proportional to 18,689.80, 28,038.72 and 5,543.08 is: 8,315.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,689.80 : 28,038.72 = 5,543.08 : x
  2. Step 2: Convert to fraction form
    18,689.80/28,038.72 = 5,543.08/x
  3. Step 3: Cross multiply
    18,689.80x = 28,038.72 × 5,543.08
  4. Step 4: Simplify right side
    18,689.80x = 155,420,868.06
  5. Step 5: Solve for x
    x = 155,420,868.06/18,689.80
  6. Step 6: Final answer
    x = 8,315.81

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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.