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Finding the Fourth Proportional to 983.07, 1,356.77 and 684.79

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Solution

The fourth proportional to 983.07, 1,356.77 and 684.79 is: 945.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.07 : 1,356.77 = 684.79 : x
  2. Step 2: Convert to fraction form
    983.07/1,356.77 = 684.79/x
  3. Step 3: Cross multiply
    983.07x = 1,356.77 × 684.79
  4. Step 4: Simplify right side
    983.07x = 929,100.85
  5. Step 5: Solve for x
    x = 929,100.85/983.07
  6. Step 6: Final answer
    x = 945.10

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1.5x scale

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.