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Finding the Fourth Proportional to 764.95, 1,054.12 and 543.28

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Solution

The fourth proportional to 764.95, 1,054.12 and 543.28 is: 748.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.95 : 1,054.12 = 543.28 : x
  2. Step 2: Convert to fraction form
    764.95/1,054.12 = 543.28/x
  3. Step 3: Cross multiply
    764.95x = 1,054.12 × 543.28
  4. Step 4: Simplify right side
    764.95x = 572,679.60
  5. Step 5: Solve for x
    x = 572,679.60/764.95
  6. Step 6: Final answer
    x = 748.65

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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.