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Finding the Fourth Proportional to 862.55, 1,189.83 and 530.90

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Solution

The fourth proportional to 862.55, 1,189.83 and 530.90 is: 732.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.55 : 1,189.83 = 530.90 : x
  2. Step 2: Convert to fraction form
    862.55/1,189.83 = 530.90/x
  3. Step 3: Cross multiply
    862.55x = 1,189.83 × 530.90
  4. Step 4: Simplify right side
    862.55x = 631,684.21
  5. Step 5: Solve for x
    x = 631,684.21/862.55
  6. Step 6: Final answer
    x = 732.35

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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.