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Finding the Fourth Proportional to 28,478.99, 42,718.22 and 9,505.05

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Solution

The fourth proportional to 28,478.99, 42,718.22 and 9,505.05 is: 14,257.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,478.99 : 42,718.22 = 9,505.05 : x
  2. Step 2: Convert to fraction form
    28,478.99/42,718.22 = 9,505.05/x
  3. Step 3: Cross multiply
    28,478.99x = 42,718.22 × 9,505.05
  4. Step 4: Simplify right side
    28,478.99x = 406,038,817.01
  5. Step 5: Solve for x
    x = 406,038,817.01/28,478.99
  6. Step 6: Final answer
    x = 14,257.49

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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.