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Finding the Fourth Proportional to 1,291.79, 1,925.25 and 1,289.74

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Solution

The fourth proportional to 1,291.79, 1,925.25 and 1,289.74 is: 1,922.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.79 : 1,925.25 = 1,289.74 : x
  2. Step 2: Convert to fraction form
    1,291.79/1,925.25 = 1,289.74/x
  3. Step 3: Cross multiply
    1,291.79x = 1,925.25 × 1,289.74
  4. Step 4: Simplify right side
    1,291.79x = 2,483,071.94
  5. Step 5: Solve for x
    x = 2,483,071.94/1,291.79
  6. Step 6: Final answer
    x = 1,922.19

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.