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Finding the Fourth Proportional to 965.74, 1,448.80 and 388.66

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Solution

The fourth proportional to 965.74, 1,448.80 and 388.66 is: 583.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    965.74 : 1,448.80 = 388.66 : x
  2. Step 2: Convert to fraction form
    965.74/1,448.80 = 388.66/x
  3. Step 3: Cross multiply
    965.74x = 1,448.80 × 388.66
  4. Step 4: Simplify right side
    965.74x = 563,090.61
  5. Step 5: Solve for x
    x = 563,090.61/965.74
  6. Step 6: Final answer
    x = 583.07

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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.