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Finding the Fourth Proportional to 751.42, 1,127.13 and 386.31

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Solution

The fourth proportional to 751.42, 1,127.13 and 386.31 is: 579.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.42 : 1,127.13 = 386.31 : x
  2. Step 2: Convert to fraction form
    751.42/1,127.13 = 386.31/x
  3. Step 3: Cross multiply
    751.42x = 1,127.13 × 386.31
  4. Step 4: Simplify right side
    751.42x = 435,421.59
  5. Step 5: Solve for x
    x = 435,421.59/751.42
  6. Step 6: Final answer
    x = 579.47

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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.