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Finding the Fourth Proportional to 919.40, 1,330.25 and 919.40

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Solution

The fourth proportional to 919.40, 1,330.25 and 919.40 is: 1,330.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.40 : 1,330.25 = 919.40 : x
  2. Step 2: Convert to fraction form
    919.40/1,330.25 = 919.40/x
  3. Step 3: Cross multiply
    919.40x = 1,330.25 × 919.40
  4. Step 4: Simplify right side
    919.40x = 1,223,031.85
  5. Step 5: Solve for x
    x = 1,223,031.85/919.40
  6. Step 6: Final answer
    x = 1,330.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.