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Finding the Fourth Proportional to 751.20, 1,036.53 and 485.70

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Solution

The fourth proportional to 751.20, 1,036.53 and 485.70 is: 670.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.20 : 1,036.53 = 485.70 : x
  2. Step 2: Convert to fraction form
    751.20/1,036.53 = 485.70/x
  3. Step 3: Cross multiply
    751.20x = 1,036.53 × 485.70
  4. Step 4: Simplify right side
    751.20x = 503,442.62
  5. Step 5: Solve for x
    x = 503,442.62/751.20
  6. Step 6: Final answer
    x = 670.18

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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.