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Finding the Fourth Proportional to 19,157.28, 28,718.88 and 7,478.68

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Solution

The fourth proportional to 19,157.28, 28,718.88 and 7,478.68 is: 11,211.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,157.28 : 28,718.88 = 7,478.68 : x
  2. Step 2: Convert to fraction form
    19,157.28/28,718.88 = 7,478.68/x
  3. Step 3: Cross multiply
    19,157.28x = 28,718.88 × 7,478.68
  4. Step 4: Simplify right side
    19,157.28x = 214,779,313.48
  5. Step 5: Solve for x
    x = 214,779,313.48/19,157.28
  6. Step 6: Final answer
    x = 11,211.37

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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.