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Finding the Fourth Proportional to 388.96, 535.80 and 315.07

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Solution

The fourth proportional to 388.96, 535.80 and 315.07 is: 434.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.96 : 535.80 = 315.07 : x
  2. Step 2: Convert to fraction form
    388.96/535.80 = 315.07/x
  3. Step 3: Cross multiply
    388.96x = 535.80 × 315.07
  4. Step 4: Simplify right side
    388.96x = 168,814.51
  5. Step 5: Solve for x
    x = 168,814.51/388.96
  6. Step 6: Final answer
    x = 434.02

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.