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Finding the Fourth Proportional to 28,478.72, 42,718.09 and 7,418.70

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Solution

The fourth proportional to 28,478.72, 42,718.09 and 7,418.70 is: 11,128.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,478.72 : 42,718.09 = 7,418.70 : x
  2. Step 2: Convert to fraction form
    28,478.72/42,718.09 = 7,418.70/x
  3. Step 3: Cross multiply
    28,478.72x = 42,718.09 × 7,418.70
  4. Step 4: Simplify right side
    28,478.72x = 316,912,675.74
  5. Step 5: Solve for x
    x = 316,912,675.74/28,478.72
  6. Step 6: Final answer
    x = 11,128.05

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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.