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Finding the Fourth Proportional to 751.09, 1,036.21 and 489.01

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Solution

The fourth proportional to 751.09, 1,036.21 and 489.01 is: 674.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.09 : 1,036.21 = 489.01 : x
  2. Step 2: Convert to fraction form
    751.09/1,036.21 = 489.01/x
  3. Step 3: Cross multiply
    751.09x = 1,036.21 × 489.01
  4. Step 4: Simplify right side
    751.09x = 506,714.61
  5. Step 5: Solve for x
    x = 506,714.61/751.09
  6. Step 6: Final answer
    x = 674.64

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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.