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Finding the Fourth Proportional to 897.75, 1,238.76 and 499.38

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Solution

The fourth proportional to 897.75, 1,238.76 and 499.38 is: 689.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    897.75 : 1,238.76 = 499.38 : x
  2. Step 2: Convert to fraction form
    897.75/1,238.76 = 499.38/x
  3. Step 3: Cross multiply
    897.75x = 1,238.76 × 499.38
  4. Step 4: Simplify right side
    897.75x = 618,611.97
  5. Step 5: Solve for x
    x = 618,611.97/897.75
  6. Step 6: Final answer
    x = 689.07

Related Problems

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Half scale
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Double scale
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Similar ratio
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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.