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Finding the Fourth Proportional to 290.52, 435.60 and 128.16

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Solution

The fourth proportional to 290.52, 435.60 and 128.16 is: 192.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.52 : 435.60 = 128.16 : x
  2. Step 2: Convert to fraction form
    290.52/435.60 = 128.16/x
  3. Step 3: Cross multiply
    290.52x = 435.60 × 128.16
  4. Step 4: Simplify right side
    290.52x = 55,826.50
  5. Step 5: Solve for x
    x = 55,826.50/290.52
  6. Step 6: Final answer
    x = 192.16

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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.