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Finding the Fourth Proportional to 897.85, 1,238.98 and 499.50

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Solution

The fourth proportional to 897.85, 1,238.98 and 499.50 is: 689.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    897.85 : 1,238.98 = 499.50 : x
  2. Step 2: Convert to fraction form
    897.85/1,238.98 = 499.50/x
  3. Step 3: Cross multiply
    897.85x = 1,238.98 × 499.50
  4. Step 4: Simplify right side
    897.85x = 618,870.51
  5. Step 5: Solve for x
    x = 618,870.51/897.85
  6. Step 6: Final answer
    x = 689.28

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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.