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Finding the Fourth Proportional to 840.24, 1,260.70 and 353.63

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Solution

The fourth proportional to 840.24, 1,260.70 and 353.63 is: 530.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.24 : 1,260.70 = 353.63 : x
  2. Step 2: Convert to fraction form
    840.24/1,260.70 = 353.63/x
  3. Step 3: Cross multiply
    840.24x = 1,260.70 × 353.63
  4. Step 4: Simplify right side
    840.24x = 445,823.61
  5. Step 5: Solve for x
    x = 445,823.61/840.24
  6. Step 6: Final answer
    x = 530.59

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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.