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Finding the Fourth Proportional to 1,544.64, 2,316.98 and 390.39

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Solution

The fourth proportional to 1,544.64, 2,316.98 and 390.39 is: 585.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,544.64 : 2,316.98 = 390.39 : x
  2. Step 2: Convert to fraction form
    1,544.64/2,316.98 = 390.39/x
  3. Step 3: Cross multiply
    1,544.64x = 2,316.98 × 390.39
  4. Step 4: Simplify right side
    1,544.64x = 904,523.87
  5. Step 5: Solve for x
    x = 904,523.87/1,544.64
  6. Step 6: Final answer
    x = 585.59

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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.