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Finding the Fourth Proportional to 291.01, 436.37 and 128.51

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Solution

The fourth proportional to 291.01, 436.37 and 128.51 is: 192.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.01 : 436.37 = 128.51 : x
  2. Step 2: Convert to fraction form
    291.01/436.37 = 128.51/x
  3. Step 3: Cross multiply
    291.01x = 436.37 × 128.51
  4. Step 4: Simplify right side
    291.01x = 56,077.91
  5. Step 5: Solve for x
    x = 56,077.91/291.01
  6. Step 6: Final answer
    x = 192.70

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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.