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Finding the Fourth Proportional to 436.19, 651.45 and 390.83

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Solution

The fourth proportional to 436.19, 651.45 and 390.83 is: 583.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    436.19 : 651.45 = 390.83 : x
  2. Step 2: Convert to fraction form
    436.19/651.45 = 390.83/x
  3. Step 3: Cross multiply
    436.19x = 651.45 × 390.83
  4. Step 4: Simplify right side
    436.19x = 254,604.25
  5. Step 5: Solve for x
    x = 254,604.25/436.19
  6. Step 6: Final answer
    x = 583.70

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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.