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Finding the Fourth Proportional to 751.77, 1,127.66 and 289.47

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Solution

The fourth proportional to 751.77, 1,127.66 and 289.47 is: 434.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.77 : 1,127.66 = 289.47 : x
  2. Step 2: Convert to fraction form
    751.77/1,127.66 = 289.47/x
  3. Step 3: Cross multiply
    751.77x = 1,127.66 × 289.47
  4. Step 4: Simplify right side
    751.77x = 326,420.24
  5. Step 5: Solve for x
    x = 326,420.24/751.77
  6. Step 6: Final answer
    x = 434.20

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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.