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Finding the Fourth Proportional to 728.98, 1,090.74 and 435.40

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Solution

The fourth proportional to 728.98, 1,090.74 and 435.40 is: 651.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.98 : 1,090.74 = 435.40 : x
  2. Step 2: Convert to fraction form
    728.98/1,090.74 = 435.40/x
  3. Step 3: Cross multiply
    728.98x = 1,090.74 × 435.40
  4. Step 4: Simplify right side
    728.98x = 474,908.20
  5. Step 5: Solve for x
    x = 474,908.20/728.98
  6. Step 6: Final answer
    x = 651.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.