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Finding the Fourth Proportional to 991.07, 1,486.59 and 661.70

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Solution

The fourth proportional to 991.07, 1,486.59 and 661.70 is: 992.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.07 : 1,486.59 = 661.70 : x
  2. Step 2: Convert to fraction form
    991.07/1,486.59 = 661.70/x
  3. Step 3: Cross multiply
    991.07x = 1,486.59 × 661.70
  4. Step 4: Simplify right side
    991.07x = 983,669.17
  5. Step 5: Solve for x
    x = 983,669.17/991.07
  6. Step 6: Final answer
    x = 992.54

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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.