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Finding the Fourth Proportional to 388.76, 582.88 and 145.40

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Solution

The fourth proportional to 388.76, 582.88 and 145.40 is: 218.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.76 : 582.88 = 145.40 : x
  2. Step 2: Convert to fraction form
    388.76/582.88 = 145.40/x
  3. Step 3: Cross multiply
    388.76x = 582.88 × 145.40
  4. Step 4: Simplify right side
    388.76x = 84,750.75
  5. Step 5: Solve for x
    x = 84,750.75/388.76
  6. Step 6: Final answer
    x = 218.00

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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.