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Finding the Fourth Proportional to 643.37, 891.58 and 631.06

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Solution

The fourth proportional to 643.37, 891.58 and 631.06 is: 874.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.37 : 891.58 = 631.06 : x
  2. Step 2: Convert to fraction form
    643.37/891.58 = 631.06/x
  3. Step 3: Cross multiply
    643.37x = 891.58 × 631.06
  4. Step 4: Simplify right side
    643.37x = 562,637.85
  5. Step 5: Solve for x
    x = 562,637.85/643.37
  6. Step 6: Final answer
    x = 874.52

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.