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Finding the Fourth Proportional to 983.36, 1,356.36 and 688.52

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Solution

The fourth proportional to 983.36, 1,356.36 and 688.52 is: 949.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.36 : 1,356.36 = 688.52 : x
  2. Step 2: Convert to fraction form
    983.36/1,356.36 = 688.52/x
  3. Step 3: Cross multiply
    983.36x = 1,356.36 × 688.52
  4. Step 4: Simplify right side
    983.36x = 933,880.99
  5. Step 5: Solve for x
    x = 933,880.99/983.36
  6. Step 6: Final answer
    x = 949.68

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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.