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Finding the Fourth Proportional to 708.92, 1,064.43 and 612.18

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Solution

The fourth proportional to 708.92, 1,064.43 and 612.18 is: 919.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.92 : 1,064.43 = 612.18 : x
  2. Step 2: Convert to fraction form
    708.92/1,064.43 = 612.18/x
  3. Step 3: Cross multiply
    708.92x = 1,064.43 × 612.18
  4. Step 4: Simplify right side
    708.92x = 651,622.76
  5. Step 5: Solve for x
    x = 651,622.76/708.92
  6. Step 6: Final answer
    x = 919.18

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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.