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Finding the Fourth Proportional to 751.60, 1,125.90 and 661.40

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Solution

The fourth proportional to 751.60, 1,125.90 and 661.40 is: 990.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.60 : 1,125.90 = 661.40 : x
  2. Step 2: Convert to fraction form
    751.60/1,125.90 = 661.40/x
  3. Step 3: Cross multiply
    751.60x = 1,125.90 × 661.40
  4. Step 4: Simplify right side
    751.60x = 744,670.26
  5. Step 5: Solve for x
    x = 744,670.26/751.60
  6. Step 6: Final answer
    x = 990.78

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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.