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Finding the Fourth Proportional to 862.30, 1,189.88 and 530.72

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Solution

The fourth proportional to 862.30, 1,189.88 and 530.72 is: 732.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.30 : 1,189.88 = 530.72 : x
  2. Step 2: Convert to fraction form
    862.30/1,189.88 = 530.72/x
  3. Step 3: Cross multiply
    862.30x = 1,189.88 × 530.72
  4. Step 4: Simplify right side
    862.30x = 631,493.11
  5. Step 5: Solve for x
    x = 631,493.11/862.30
  6. Step 6: Final answer
    x = 732.34

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1.5x scale

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.