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Finding the Fourth Proportional to 293.10, 439.53 and 128.50

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Solution

The fourth proportional to 293.10, 439.53 and 128.50 is: 192.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    293.10 : 439.53 = 128.50 : x
  2. Step 2: Convert to fraction form
    293.10/439.53 = 128.50/x
  3. Step 3: Cross multiply
    293.10x = 439.53 × 128.50
  4. Step 4: Simplify right side
    293.10x = 56,479.61
  5. Step 5: Solve for x
    x = 56,479.61/293.10
  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.