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Finding the Fourth Proportional to 770.40, 1,062.78 and 475.48

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Solution

The fourth proportional to 770.40, 1,062.78 and 475.48 is: 655.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.40 : 1,062.78 = 475.48 : x
  2. Step 2: Convert to fraction form
    770.40/1,062.78 = 475.48/x
  3. Step 3: Cross multiply
    770.40x = 1,062.78 × 475.48
  4. Step 4: Simplify right side
    770.40x = 505,330.63
  5. Step 5: Solve for x
    x = 505,330.63/770.40
  6. Step 6: Final answer
    x = 655.93

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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.