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Finding the Fourth Proportional to 1,394.79, 1,925.10 and 805.29

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Solution

The fourth proportional to 1,394.79, 1,925.10 and 805.29 is: 1,111.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,394.79 : 1,925.10 = 805.29 : x
  2. Step 2: Convert to fraction form
    1,394.79/1,925.10 = 805.29/x
  3. Step 3: Cross multiply
    1,394.79x = 1,925.10 × 805.29
  4. Step 4: Simplify right side
    1,394.79x = 1,550,263.78
  5. Step 5: Solve for x
    x = 1,550,263.78/1,394.79
  6. Step 6: Final answer
    x = 1,111.47

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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.