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Finding the Fourth Proportional to 436.12, 651.05 and 420.93

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Solution

The fourth proportional to 436.12, 651.05 and 420.93 is: 628.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    436.12 : 651.05 = 420.93 : x
  2. Step 2: Convert to fraction form
    436.12/651.05 = 420.93/x
  3. Step 3: Cross multiply
    436.12x = 651.05 × 420.93
  4. Step 4: Simplify right side
    436.12x = 274,048.32
  5. Step 5: Solve for x
    x = 274,048.32/436.12
  6. Step 6: Final answer
    x = 628.38

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.