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Finding the Fourth Proportional to 825.21, 1,139.40 and 530.64

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Solution

The fourth proportional to 825.21, 1,139.40 and 530.64 is: 732.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.21 : 1,139.40 = 530.64 : x
  2. Step 2: Convert to fraction form
    825.21/1,139.40 = 530.64/x
  3. Step 3: Cross multiply
    825.21x = 1,139.40 × 530.64
  4. Step 4: Simplify right side
    825.21x = 604,611.22
  5. Step 5: Solve for x
    x = 604,611.22/825.21
  6. Step 6: Final answer
    x = 732.68

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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.