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Finding the Fourth Proportional to 897.38, 1,238.40 and 499.06

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Solution

The fourth proportional to 897.38, 1,238.40 and 499.06 is: 688.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    897.38 : 1,238.40 = 499.06 : x
  2. Step 2: Convert to fraction form
    897.38/1,238.40 = 499.06/x
  3. Step 3: Cross multiply
    897.38x = 1,238.40 × 499.06
  4. Step 4: Simplify right side
    897.38x = 618,035.90
  5. Step 5: Solve for x
    x = 618,035.90/897.38
  6. Step 6: Final answer
    x = 688.71

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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.