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Finding the Fourth Proportional to 647.15, 890.88 and 584.79

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Solution

The fourth proportional to 647.15, 890.88 and 584.79 is: 805.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.15 : 890.88 = 584.79 : x
  2. Step 2: Convert to fraction form
    647.15/890.88 = 584.79/x
  3. Step 3: Cross multiply
    647.15x = 890.88 × 584.79
  4. Step 4: Simplify right side
    647.15x = 520,972.18
  5. Step 5: Solve for x
    x = 520,972.18/647.15
  6. Step 6: Final answer
    x = 805.03

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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.