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Finding the Fourth Proportional to 714.65, 986.69 and 478.94

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Solution

The fourth proportional to 714.65, 986.69 and 478.94 is: 661.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.65 : 986.69 = 478.94 : x
  2. Step 2: Convert to fraction form
    714.65/986.69 = 478.94/x
  3. Step 3: Cross multiply
    714.65x = 986.69 × 478.94
  4. Step 4: Simplify right side
    714.65x = 472,562.91
  5. Step 5: Solve for x
    x = 472,562.91/714.65
  6. Step 6: Final answer
    x = 661.25

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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.