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Finding the Fourth Proportional to 983.66, 1,357.32 and 558.26

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Solution

The fourth proportional to 983.66, 1,357.32 and 558.26 is: 770.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.66 : 1,357.32 = 558.26 : x
  2. Step 2: Convert to fraction form
    983.66/1,357.32 = 558.26/x
  3. Step 3: Cross multiply
    983.66x = 1,357.32 × 558.26
  4. Step 4: Simplify right side
    983.66x = 757,737.46
  5. Step 5: Solve for x
    x = 757,737.46/983.66
  6. Step 6: Final answer
    x = 770.32

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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.