Home / 1,243.02-1,715.38-977.80

Finding the Fourth Proportional to 1,243.02, 1,715.38 and 977.80

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Solution

The fourth proportional to 1,243.02, 1,715.38 and 977.80 is: 1,349.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.02 : 1,715.38 = 977.80 : x
  2. Step 2: Convert to fraction form
    1,243.02/1,715.38 = 977.80/x
  3. Step 3: Cross multiply
    1,243.02x = 1,715.38 × 977.80
  4. Step 4: Simplify right side
    1,243.02x = 1,677,298.56
  5. Step 5: Solve for x
    x = 1,677,298.56/1,243.02
  6. Step 6: Final answer
    x = 1,349.37

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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.