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Finding the Fourth Proportional to 790.20, 1,090.38 and 440.76

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Solution

The fourth proportional to 790.20, 1,090.38 and 440.76 is: 608.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.20 : 1,090.38 = 440.76 : x
  2. Step 2: Convert to fraction form
    790.20/1,090.38 = 440.76/x
  3. Step 3: Cross multiply
    790.20x = 1,090.38 × 440.76
  4. Step 4: Simplify right side
    790.20x = 480,595.89
  5. Step 5: Solve for x
    x = 480,595.89/790.20
  6. Step 6: Final answer
    x = 608.20

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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.