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Finding the Fourth Proportional to 1,544.25, 2,316.38 and 390

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Solution

The fourth proportional to 1,544.25, 2,316.38 and 390 is: 585

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,544.25 : 2,316.38 = 390 : x
  2. Step 2: Convert to fraction form
    1,544.25/2,316.38 = 390/x
  3. Step 3: Cross multiply
    1,544.25x = 2,316.38 × 390
  4. Step 4: Simplify right side
    1,544.25x = 903,386.25
  5. Step 5: Solve for x
    x = 903,386.25/1,544.25
  6. Step 6: Final answer
    x = 585

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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.