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Finding the Fourth Proportional to 698.06, 1,045.20 and 423.60

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Solution

The fourth proportional to 698.06, 1,045.20 and 423.60 is: 634.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.06 : 1,045.20 = 423.60 : x
  2. Step 2: Convert to fraction form
    698.06/1,045.20 = 423.60/x
  3. Step 3: Cross multiply
    698.06x = 1,045.20 × 423.60
  4. Step 4: Simplify right side
    698.06x = 442,746.72
  5. Step 5: Solve for x
    x = 442,746.72/698.06
  6. Step 6: Final answer
    x = 634.25

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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.