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Finding the Fourth Proportional to 751.68, 1,128.60 and 557.28

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Solution

The fourth proportional to 751.68, 1,128.60 and 557.28 is: 836.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.68 : 1,128.60 = 557.28 : x
  2. Step 2: Convert to fraction form
    751.68/1,128.60 = 557.28/x
  3. Step 3: Cross multiply
    751.68x = 1,128.60 × 557.28
  4. Step 4: Simplify right side
    751.68x = 628,946.21
  5. Step 5: Solve for x
    x = 628,946.21/751.68
  6. Step 6: Final answer
    x = 836.72

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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.