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Finding the Fourth Proportional to 560.78, 773.92 and 420.64

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Solution

The fourth proportional to 560.78, 773.92 and 420.64 is: 580.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    560.78 : 773.92 = 420.64 : x
  2. Step 2: Convert to fraction form
    560.78/773.92 = 420.64/x
  3. Step 3: Cross multiply
    560.78x = 773.92 × 420.64
  4. Step 4: Simplify right side
    560.78x = 325,541.71
  5. Step 5: Solve for x
    x = 325,541.71/560.78
  6. Step 6: Final answer
    x = 580.52

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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.