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Finding the Fourth Proportional to 991.10, 1,485.74 and 503.60

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Solution

The fourth proportional to 991.10, 1,485.74 and 503.60 is: 754.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.10 : 1,485.74 = 503.60 : x
  2. Step 2: Convert to fraction form
    991.10/1,485.74 = 503.60/x
  3. Step 3: Cross multiply
    991.10x = 1,485.74 × 503.60
  4. Step 4: Simplify right side
    991.10x = 748,212.49
  5. Step 5: Solve for x
    x = 748,212.49/991.10
  6. Step 6: Final answer
    x = 754.93

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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.