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Finding the Fourth Proportional to 388.79, 536.72 and 319.02

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Solution

The fourth proportional to 388.79, 536.72 and 319.02 is: 440.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.79 : 536.72 = 319.02 : x
  2. Step 2: Convert to fraction form
    388.79/536.72 = 319.02/x
  3. Step 3: Cross multiply
    388.79x = 536.72 × 319.02
  4. Step 4: Simplify right side
    388.79x = 171,222.82
  5. Step 5: Solve for x
    x = 171,222.82/388.79
  6. Step 6: Final answer
    x = 440.40

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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.