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Finding the Fourth Proportional to 921.52, 1,271.44 and 528.40

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Solution

The fourth proportional to 921.52, 1,271.44 and 528.40 is: 729.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.52 : 1,271.44 = 528.40 : x
  2. Step 2: Convert to fraction form
    921.52/1,271.44 = 528.40/x
  3. Step 3: Cross multiply
    921.52x = 1,271.44 × 528.40
  4. Step 4: Simplify right side
    921.52x = 671,828.90
  5. Step 5: Solve for x
    x = 671,828.90/921.52
  6. Step 6: Final answer
    x = 729.04

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.