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Finding the Fourth Proportional to 702.76, 1,054.35 and 312.75

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Solution

The fourth proportional to 702.76, 1,054.35 and 312.75 is: 469.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    702.76 : 1,054.35 = 312.75 : x
  2. Step 2: Convert to fraction form
    702.76/1,054.35 = 312.75/x
  3. Step 3: Cross multiply
    702.76x = 1,054.35 × 312.75
  4. Step 4: Simplify right side
    702.76x = 329,747.96
  5. Step 5: Solve for x
    x = 329,747.96/702.76
  6. Step 6: Final answer
    x = 469.22

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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.