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Finding the Fourth Proportional to 751.70, 1,037.34 and 420.12

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Solution

The fourth proportional to 751.70, 1,037.34 and 420.12 is: 579.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.70 : 1,037.34 = 420.12 : x
  2. Step 2: Convert to fraction form
    751.70/1,037.34 = 420.12/x
  3. Step 3: Cross multiply
    751.70x = 1,037.34 × 420.12
  4. Step 4: Simplify right side
    751.70x = 435,803.76
  5. Step 5: Solve for x
    x = 435,803.76/751.70
  6. Step 6: Final answer
    x = 579.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.