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Finding the Fourth Proportional to 983.80, 1,345.97 and 974.08

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Solution

The fourth proportional to 983.80, 1,345.97 and 974.08 is: 1,332.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.80 : 1,345.97 = 974.08 : x
  2. Step 2: Convert to fraction form
    983.80/1,345.97 = 974.08/x
  3. Step 3: Cross multiply
    983.80x = 1,345.97 × 974.08
  4. Step 4: Simplify right side
    983.80x = 1,311,082.46
  5. Step 5: Solve for x
    x = 1,311,082.46/983.80
  6. Step 6: Final answer
    x = 1,332.67

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.