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Finding the Fourth Proportional to 751.49, 1,124.45 and 455.16

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Solution

The fourth proportional to 751.49, 1,124.45 and 455.16 is: 681.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.49 : 1,124.45 = 455.16 : x
  2. Step 2: Convert to fraction form
    751.49/1,124.45 = 455.16/x
  3. Step 3: Cross multiply
    751.49x = 1,124.45 × 455.16
  4. Step 4: Simplify right side
    751.49x = 511,804.66
  5. Step 5: Solve for x
    x = 511,804.66/751.49
  6. Step 6: Final answer
    x = 681.05

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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.