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Finding the Fourth Proportional to 921.37, 1,271.52 and 528.40

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Solution

The fourth proportional to 921.37, 1,271.52 and 528.40 is: 729.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.37 : 1,271.52 = 528.40 : x
  2. Step 2: Convert to fraction form
    921.37/1,271.52 = 528.40/x
  3. Step 3: Cross multiply
    921.37x = 1,271.52 × 528.40
  4. Step 4: Simplify right side
    921.37x = 671,871.17
  5. Step 5: Solve for x
    x = 671,871.17/921.37
  6. Step 6: Final answer
    x = 729.21

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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.