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Finding the Fourth Proportional to 840.70, 1,260.70 and 346.78

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Solution

The fourth proportional to 840.70, 1,260.70 and 346.78 is: 520.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.70 : 1,260.70 = 346.78 : x
  2. Step 2: Convert to fraction form
    840.70/1,260.70 = 346.78/x
  3. Step 3: Cross multiply
    840.70x = 1,260.70 × 346.78
  4. Step 4: Simplify right side
    840.70x = 437,185.55
  5. Step 5: Solve for x
    x = 437,185.55/840.70
  6. Step 6: Final answer
    x = 520.03

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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.