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Finding the Fourth Proportional to 985.30, 1,330.88 and 985.30

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Solution

The fourth proportional to 985.30, 1,330.88 and 985.30 is: 1,330.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.30 : 1,330.88 = 985.30 : x
  2. Step 2: Convert to fraction form
    985.30/1,330.88 = 985.30/x
  3. Step 3: Cross multiply
    985.30x = 1,330.88 × 985.30
  4. Step 4: Simplify right side
    985.30x = 1,311,311.14
  5. Step 5: Solve for x
    x = 1,311,311.14/985.30
  6. Step 6: Final answer
    x = 1,330.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.