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Finding the Fourth Proportional to 672.45, 928.01 and 420.52

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Solution

The fourth proportional to 672.45, 928.01 and 420.52 is: 580.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.45 : 928.01 = 420.52 : x
  2. Step 2: Convert to fraction form
    672.45/928.01 = 420.52/x
  3. Step 3: Cross multiply
    672.45x = 928.01 × 420.52
  4. Step 4: Simplify right side
    672.45x = 390,242.26
  5. Step 5: Solve for x
    x = 390,242.26/672.45
  6. Step 6: Final answer
    x = 580.33

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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.