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Finding the Fourth Proportional to 947.58, 1,421.55 and 427.60

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Solution

The fourth proportional to 947.58, 1,421.55 and 427.60 is: 641.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.58 : 1,421.55 = 427.60 : x
  2. Step 2: Convert to fraction form
    947.58/1,421.55 = 427.60/x
  3. Step 3: Cross multiply
    947.58x = 1,421.55 × 427.60
  4. Step 4: Simplify right side
    947.58x = 607,854.78
  5. Step 5: Solve for x
    x = 607,854.78/947.58
  6. Step 6: Final answer
    x = 641.48

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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.