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Finding the Fourth Proportional to 678.29, 1,017.43 and 245.45

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Solution

The fourth proportional to 678.29, 1,017.43 and 245.45 is: 368.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.29 : 1,017.43 = 245.45 : x
  2. Step 2: Convert to fraction form
    678.29/1,017.43 = 245.45/x
  3. Step 3: Cross multiply
    678.29x = 1,017.43 × 245.45
  4. Step 4: Simplify right side
    678.29x = 249,722.49
  5. Step 5: Solve for x
    x = 249,722.49/678.29
  6. Step 6: Final answer
    x = 368.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.