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Finding the Fourth Proportional to 918.60, 1,267.86 and 586.80

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Solution

The fourth proportional to 918.60, 1,267.86 and 586.80 is: 809.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.60 : 1,267.86 = 586.80 : x
  2. Step 2: Convert to fraction form
    918.60/1,267.86 = 586.80/x
  3. Step 3: Cross multiply
    918.60x = 1,267.86 × 586.80
  4. Step 4: Simplify right side
    918.60x = 743,980.25
  5. Step 5: Solve for x
    x = 743,980.25/918.60
  6. Step 6: Final answer
    x = 809.91

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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.