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Finding the Fourth Proportional to 839.21, 1,157.87 and 507.40

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Solution

The fourth proportional to 839.21, 1,157.87 and 507.40 is: 700.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.21 : 1,157.87 = 507.40 : x
  2. Step 2: Convert to fraction form
    839.21/1,157.87 = 507.40/x
  3. Step 3: Cross multiply
    839.21x = 1,157.87 × 507.40
  4. Step 4: Simplify right side
    839.21x = 587,497.45
  5. Step 5: Solve for x
    x = 587,497.45/839.21
  6. Step 6: Final answer
    x = 700.06

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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.