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Finding the Fourth Proportional to 751.78, 1,128.13 and 318.94

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Solution

The fourth proportional to 751.78, 1,128.13 and 318.94 is: 478.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.78 : 1,128.13 = 318.94 : x
  2. Step 2: Convert to fraction form
    751.78/1,128.13 = 318.94/x
  3. Step 3: Cross multiply
    751.78x = 1,128.13 × 318.94
  4. Step 4: Simplify right side
    751.78x = 359,802.16
  5. Step 5: Solve for x
    x = 359,802.16/751.78
  6. Step 6: Final answer
    x = 478.60

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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.