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Finding the Fourth Proportional to 751.40, 1,036.96 and 415.32

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Solution

The fourth proportional to 751.40, 1,036.96 and 415.32 is: 573.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.40 : 1,036.96 = 415.32 : x
  2. Step 2: Convert to fraction form
    751.40/1,036.96 = 415.32/x
  3. Step 3: Cross multiply
    751.40x = 1,036.96 × 415.32
  4. Step 4: Simplify right side
    751.40x = 430,670.23
  5. Step 5: Solve for x
    x = 430,670.23/751.40
  6. Step 6: Final answer
    x = 573.16

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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.