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Finding the Fourth Proportional to 991.03, 1,486.62 and 260.59

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Solution

The fourth proportional to 991.03, 1,486.62 and 260.59 is: 390.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.03 : 1,486.62 = 260.59 : x
  2. Step 2: Convert to fraction form
    991.03/1,486.62 = 260.59/x
  3. Step 3: Cross multiply
    991.03x = 1,486.62 × 260.59
  4. Step 4: Simplify right side
    991.03x = 387,390.87
  5. Step 5: Solve for x
    x = 387,390.87/991.03
  6. Step 6: Final answer
    x = 390.90

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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.