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Finding the Fourth Proportional to 899.21, 1,240.84 and 500.87

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Solution

The fourth proportional to 899.21, 1,240.84 and 500.87 is: 691.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.21 : 1,240.84 = 500.87 : x
  2. Step 2: Convert to fraction form
    899.21/1,240.84 = 500.87/x
  3. Step 3: Cross multiply
    899.21x = 1,240.84 × 500.87
  4. Step 4: Simplify right side
    899.21x = 621,492.07
  5. Step 5: Solve for x
    x = 621,492.07/899.21
  6. Step 6: Final answer
    x = 691.15

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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.