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Finding the Fourth Proportional to 651.79, 977.54 and 388.36

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Solution

The fourth proportional to 651.79, 977.54 and 388.36 is: 582.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.79 : 977.54 = 388.36 : x
  2. Step 2: Convert to fraction form
    651.79/977.54 = 388.36/x
  3. Step 3: Cross multiply
    651.79x = 977.54 × 388.36
  4. Step 4: Simplify right side
    651.79x = 379,632.55
  5. Step 5: Solve for x
    x = 379,632.55/651.79
  6. Step 6: Final answer
    x = 582.45

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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.