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Finding the Fourth Proportional to 751.70, 1,127.55 and 427.70

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Solution

The fourth proportional to 751.70, 1,127.55 and 427.70 is: 641.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.70 : 1,127.55 = 427.70 : x
  2. Step 2: Convert to fraction form
    751.70/1,127.55 = 427.70/x
  3. Step 3: Cross multiply
    751.70x = 1,127.55 × 427.70
  4. Step 4: Simplify right side
    751.70x = 482,253.14
  5. Step 5: Solve for x
    x = 482,253.14/751.70
  6. Step 6: Final answer
    x = 641.55

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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.