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Finding the Fourth Proportional to 860.94, 1,291.95 and 313.16

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Solution

The fourth proportional to 860.94, 1,291.95 and 313.16 is: 469.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.94 : 1,291.95 = 313.16 : x
  2. Step 2: Convert to fraction form
    860.94/1,291.95 = 313.16/x
  3. Step 3: Cross multiply
    860.94x = 1,291.95 × 313.16
  4. Step 4: Simplify right side
    860.94x = 404,587.06
  5. Step 5: Solve for x
    x = 404,587.06/860.94
  6. Step 6: Final answer
    x = 469.94

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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.