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Finding the Fourth Proportional to 654.84, 903.40 and 642.48

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Solution

The fourth proportional to 654.84, 903.40 and 642.48 is: 886.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.84 : 903.40 = 642.48 : x
  2. Step 2: Convert to fraction form
    654.84/903.40 = 642.48/x
  3. Step 3: Cross multiply
    654.84x = 903.40 × 642.48
  4. Step 4: Simplify right side
    654.84x = 580,416.43
  5. Step 5: Solve for x
    x = 580,416.43/654.84
  6. Step 6: Final answer
    x = 886.35

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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.