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Finding the Fourth Proportional to 751.22, 1,036.90 and 440.78

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Solution

The fourth proportional to 751.22, 1,036.90 and 440.78 is: 608.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.22 : 1,036.90 = 440.78 : x
  2. Step 2: Convert to fraction form
    751.22/1,036.90 = 440.78/x
  3. Step 3: Cross multiply
    751.22x = 1,036.90 × 440.78
  4. Step 4: Simplify right side
    751.22x = 457,044.78
  5. Step 5: Solve for x
    x = 457,044.78/751.22
  6. Step 6: Final answer
    x = 608.40

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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.