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Finding the Fourth Proportional to 675.84, 1,009.32 and 638.40

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Solution

The fourth proportional to 675.84, 1,009.32 and 638.40 is: 953.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    675.84 : 1,009.32 = 638.40 : x
  2. Step 2: Convert to fraction form
    675.84/1,009.32 = 638.40/x
  3. Step 3: Cross multiply
    675.84x = 1,009.32 × 638.40
  4. Step 4: Simplify right side
    675.84x = 644,349.89
  5. Step 5: Solve for x
    x = 644,349.89/675.84
  6. Step 6: Final answer
    x = 953.41

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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.