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Finding the Fourth Proportional to 56.55, 78.03 and 39.07

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Solution

The fourth proportional to 56.55, 78.03 and 39.07 is: 53.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.55 : 78.03 = 39.07 : x
  2. Step 2: Convert to fraction form
    56.55/78.03 = 39.07/x
  3. Step 3: Cross multiply
    56.55x = 78.03 × 39.07
  4. Step 4: Simplify right side
    56.55x = 3,048.63
  5. Step 5: Solve for x
    x = 3,048.63/56.55
  6. Step 6: Final answer
    x = 53.91

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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.