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Finding the Fourth Proportional to 751.30, 1,126.27 and 385.90

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Solution

The fourth proportional to 751.30, 1,126.27 and 385.90 is: 578.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.30 : 1,126.27 = 385.90 : x
  2. Step 2: Convert to fraction form
    751.30/1,126.27 = 385.90/x
  3. Step 3: Cross multiply
    751.30x = 1,126.27 × 385.90
  4. Step 4: Simplify right side
    751.30x = 434,627.59
  5. Step 5: Solve for x
    x = 434,627.59/751.30
  6. Step 6: Final answer
    x = 578.50

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1.5x scale

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.