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Finding the Fourth Proportional to 28,476.55, 42,718.91 and 8,756.77

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Solution

The fourth proportional to 28,476.55, 42,718.91 and 8,756.77 is: 13,136.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,476.55 : 42,718.91 = 8,756.77 : x
  2. Step 2: Convert to fraction form
    28,476.55/42,718.91 = 8,756.77/x
  3. Step 3: Cross multiply
    28,476.55x = 42,718.91 × 8,756.77
  4. Step 4: Simplify right side
    28,476.55x = 374,079,412.14
  5. Step 5: Solve for x
    x = 374,079,412.14/28,476.55
  6. Step 6: Final answer
    x = 13,136.40

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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.