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Finding the Fourth Proportional to 1,013.61, 1,395.77 and 990.60

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Solution

The fourth proportional to 1,013.61, 1,395.77 and 990.60 is: 1,364.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.61 : 1,395.77 = 990.60 : x
  2. Step 2: Convert to fraction form
    1,013.61/1,395.77 = 990.60/x
  3. Step 3: Cross multiply
    1,013.61x = 1,395.77 × 990.60
  4. Step 4: Simplify right side
    1,013.61x = 1,382,655.53
  5. Step 5: Solve for x
    x = 1,382,655.53/1,013.61
  6. Step 6: Final answer
    x = 1,364.09

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.