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Finding the Fourth Proportional to 18,871.76, 28,307.74 and 5,724.14

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Solution

The fourth proportional to 18,871.76, 28,307.74 and 5,724.14 is: 8,586.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,871.76 : 28,307.74 = 5,724.14 : x
  2. Step 2: Convert to fraction form
    18,871.76/28,307.74 = 5,724.14/x
  3. Step 3: Cross multiply
    18,871.76x = 28,307.74 × 5,724.14
  4. Step 4: Simplify right side
    18,871.76x = 162,037,438.22
  5. Step 5: Solve for x
    x = 162,037,438.22/18,871.76
  6. Step 6: Final answer
    x = 8,586.24

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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.