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Finding the Fourth Proportional to 702.48, 969.48 and 407.76

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Solution

The fourth proportional to 702.48, 969.48 and 407.76 is: 562.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    702.48 : 969.48 = 407.76 : x
  2. Step 2: Convert to fraction form
    702.48/969.48 = 407.76/x
  3. Step 3: Cross multiply
    702.48x = 969.48 × 407.76
  4. Step 4: Simplify right side
    702.48x = 395,315.16
  5. Step 5: Solve for x
    x = 395,315.16/702.48
  6. Step 6: Final answer
    x = 562.74

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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.