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Finding the Fourth Proportional to 991.90, 1,490.13 and 700.07

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Solution

The fourth proportional to 991.90, 1,490.13 and 700.07 is: 1,051.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.90 : 1,490.13 = 700.07 : x
  2. Step 2: Convert to fraction form
    991.90/1,490.13 = 700.07/x
  3. Step 3: Cross multiply
    991.90x = 1,490.13 × 700.07
  4. Step 4: Simplify right side
    991.90x = 1,043,193.56
  5. Step 5: Solve for x
    x = 1,043,193.56/991.90
  6. Step 6: Final answer
    x = 1,051.71

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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.