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Finding the Fourth Proportional to 28,476.42, 42,718.72 and 8,756.64

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Solution

The fourth proportional to 28,476.42, 42,718.72 and 8,756.64 is: 13,136.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,476.42 : 42,718.72 = 8,756.64 : x
  2. Step 2: Convert to fraction form
    28,476.42/42,718.72 = 8,756.64/x
  3. Step 3: Cross multiply
    28,476.42x = 42,718.72 × 8,756.64
  4. Step 4: Simplify right side
    28,476.42x = 374,072,430.41
  5. Step 5: Solve for x
    x = 374,072,430.41/28,476.42
  6. Step 6: Final answer
    x = 13,136.22

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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.