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Finding the Fourth Proportional to 751.08, 1,129.20 and 607.80

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Solution

The fourth proportional to 751.08, 1,129.20 and 607.80 is: 913.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.08 : 1,129.20 = 607.80 : x
  2. Step 2: Convert to fraction form
    751.08/1,129.20 = 607.80/x
  3. Step 3: Cross multiply
    751.08x = 1,129.20 × 607.80
  4. Step 4: Simplify right side
    751.08x = 686,327.76
  5. Step 5: Solve for x
    x = 686,327.76/751.08
  6. Step 6: Final answer
    x = 913.79

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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.