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Finding the Fourth Proportional to 1,445.39, 2,167.91 and 405.47

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Solution

The fourth proportional to 1,445.39, 2,167.91 and 405.47 is: 608.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,445.39 : 2,167.91 = 405.47 : x
  2. Step 2: Convert to fraction form
    1,445.39/2,167.91 = 405.47/x
  3. Step 3: Cross multiply
    1,445.39x = 2,167.91 × 405.47
  4. Step 4: Simplify right side
    1,445.39x = 879,009.60
  5. Step 5: Solve for x
    x = 879,009.60/1,445.39
  6. Step 6: Final answer
    x = 608.15

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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.