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Finding the Fourth Proportional to 751.88, 1,035.60 and 646.76

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Solution

The fourth proportional to 751.88, 1,035.60 and 646.76 is: 890.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.88 : 1,035.60 = 646.76 : x
  2. Step 2: Convert to fraction form
    751.88/1,035.60 = 646.76/x
  3. Step 3: Cross multiply
    751.88x = 1,035.60 × 646.76
  4. Step 4: Simplify right side
    751.88x = 669,784.66
  5. Step 5: Solve for x
    x = 669,784.66/751.88
  6. Step 6: Final answer
    x = 890.81

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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.