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Finding the Fourth Proportional to 983.79, 1,358.37 and 774.99

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Solution

The fourth proportional to 983.79, 1,358.37 and 774.99 is: 1,070.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.79 : 1,358.37 = 774.99 : x
  2. Step 2: Convert to fraction form
    983.79/1,358.37 = 774.99/x
  3. Step 3: Cross multiply
    983.79x = 1,358.37 × 774.99
  4. Step 4: Simplify right side
    983.79x = 1,052,723.17
  5. Step 5: Solve for x
    x = 1,052,723.17/983.79
  6. Step 6: Final answer
    x = 1,070.07

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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.