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Finding the Fourth Proportional to 840.72, 1,262.04 and 563.28

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Solution

The fourth proportional to 840.72, 1,262.04 and 563.28 is: 845.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.72 : 1,262.04 = 563.28 : x
  2. Step 2: Convert to fraction form
    840.72/1,262.04 = 563.28/x
  3. Step 3: Cross multiply
    840.72x = 1,262.04 × 563.28
  4. Step 4: Simplify right side
    840.72x = 710,881.89
  5. Step 5: Solve for x
    x = 710,881.89/840.72
  6. Step 6: Final answer
    x = 845.56

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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.