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Finding the Fourth Proportional to 921.60, 1,271.88 and 528.72

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Solution

The fourth proportional to 921.60, 1,271.88 and 528.72 is: 729.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.60 : 1,271.88 = 528.72 : x
  2. Step 2: Convert to fraction form
    921.60/1,271.88 = 528.72/x
  3. Step 3: Cross multiply
    921.60x = 1,271.88 × 528.72
  4. Step 4: Simplify right side
    921.60x = 672,468.39
  5. Step 5: Solve for x
    x = 672,468.39/921.60
  6. Step 6: Final answer
    x = 729.67

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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.