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Finding the Fourth Proportional to 617.80, 926.70 and 612.40

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Solution

The fourth proportional to 617.80, 926.70 and 612.40 is: 918.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.80 : 926.70 = 612.40 : x
  2. Step 2: Convert to fraction form
    617.80/926.70 = 612.40/x
  3. Step 3: Cross multiply
    617.80x = 926.70 × 612.40
  4. Step 4: Simplify right side
    617.80x = 567,511.08
  5. Step 5: Solve for x
    x = 567,511.08/617.80
  6. Step 6: Final answer
    x = 918.60

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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.