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Finding the Fourth Proportional to 19,129.88, 28,689.24 and 7,440.32

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Solution

The fourth proportional to 19,129.88, 28,689.24 and 7,440.32 is: 11,158.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,129.88 : 28,689.24 = 7,440.32 : x
  2. Step 2: Convert to fraction form
    19,129.88/28,689.24 = 7,440.32/x
  3. Step 3: Cross multiply
    19,129.88x = 28,689.24 × 7,440.32
  4. Step 4: Simplify right side
    19,129.88x = 213,457,126.16
  5. Step 5: Solve for x
    x = 213,457,126.16/19,129.88
  6. Step 6: Final answer
    x = 11,158.31

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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.