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Finding the Fourth Proportional to 991.06, 1,485.72 and 374.80

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Solution

The fourth proportional to 991.06, 1,485.72 and 374.80 is: 561.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.06 : 1,485.72 = 374.80 : x
  2. Step 2: Convert to fraction form
    991.06/1,485.72 = 374.80/x
  3. Step 3: Cross multiply
    991.06x = 1,485.72 × 374.80
  4. Step 4: Simplify right side
    991.06x = 556,847.86
  5. Step 5: Solve for x
    x = 556,847.86/991.06
  6. Step 6: Final answer
    x = 561.87

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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.