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Finding the Fourth Proportional to 918.44, 1,267.43 and 498.79

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Solution

The fourth proportional to 918.44, 1,267.43 and 498.79 is: 688.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.44 : 1,267.43 = 498.79 : x
  2. Step 2: Convert to fraction form
    918.44/1,267.43 = 498.79/x
  3. Step 3: Cross multiply
    918.44x = 1,267.43 × 498.79
  4. Step 4: Simplify right side
    918.44x = 632,181.41
  5. Step 5: Solve for x
    x = 632,181.41/918.44
  6. Step 6: Final answer
    x = 688.32

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Double scale
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1.5x scale

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.