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Finding the Fourth Proportional to 790.45, 1,090.73 and 454.40

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Solution

The fourth proportional to 790.45, 1,090.73 and 454.40 is: 627.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.45 : 1,090.73 = 454.40 : x
  2. Step 2: Convert to fraction form
    790.45/1,090.73 = 454.40/x
  3. Step 3: Cross multiply
    790.45x = 1,090.73 × 454.40
  4. Step 4: Simplify right side
    790.45x = 495,627.71
  5. Step 5: Solve for x
    x = 495,627.71/790.45
  6. Step 6: Final answer
    x = 627.02

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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.