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Finding the Fourth Proportional to 921.02, 1,270.94 and 528.02

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Solution

The fourth proportional to 921.02, 1,270.94 and 528.02 is: 728.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.02 : 1,270.94 = 528.02 : x
  2. Step 2: Convert to fraction form
    921.02/1,270.94 = 528.02/x
  3. Step 3: Cross multiply
    921.02x = 1,270.94 × 528.02
  4. Step 4: Simplify right side
    921.02x = 671,081.74
  5. Step 5: Solve for x
    x = 671,081.74/921.02
  6. Step 6: Final answer
    x = 728.63

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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.