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Finding the Fourth Proportional to 702.46, 969.28 and 407.76

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Solution

The fourth proportional to 702.46, 969.28 and 407.76 is: 562.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    702.46 : 969.28 = 407.76 : x
  2. Step 2: Convert to fraction form
    702.46/969.28 = 407.76/x
  3. Step 3: Cross multiply
    702.46x = 969.28 × 407.76
  4. Step 4: Simplify right side
    702.46x = 395,233.61
  5. Step 5: Solve for x
    x = 395,233.61/702.46
  6. Step 6: Final answer
    x = 562.64

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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.