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Finding the Fourth Proportional to 1,365.61, 1,884.12 and 805.90

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Solution

The fourth proportional to 1,365.61, 1,884.12 and 805.90 is: 1,111.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,365.61 : 1,884.12 = 805.90 : x
  2. Step 2: Convert to fraction form
    1,365.61/1,884.12 = 805.90/x
  3. Step 3: Cross multiply
    1,365.61x = 1,884.12 × 805.90
  4. Step 4: Simplify right side
    1,365.61x = 1,518,412.31
  5. Step 5: Solve for x
    x = 1,518,412.31/1,365.61
  6. Step 6: Final answer
    x = 1,111.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.