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Finding the Fourth Proportional to 955.60, 1,318.72 and 530.20

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Solution

The fourth proportional to 955.60, 1,318.72 and 530.20 is: 731.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.60 : 1,318.72 = 530.20 : x
  2. Step 2: Convert to fraction form
    955.60/1,318.72 = 530.20/x
  3. Step 3: Cross multiply
    955.60x = 1,318.72 × 530.20
  4. Step 4: Simplify right side
    955.60x = 699,185.34
  5. Step 5: Solve for x
    x = 699,185.34/955.60
  6. Step 6: Final answer
    x = 731.67

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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.