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Finding the Fourth Proportional to 770.15, 1,062.70 and 438.56

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Solution

The fourth proportional to 770.15, 1,062.70 and 438.56 is: 605.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.15 : 1,062.70 = 438.56 : x
  2. Step 2: Convert to fraction form
    770.15/1,062.70 = 438.56/x
  3. Step 3: Cross multiply
    770.15x = 1,062.70 × 438.56
  4. Step 4: Simplify right side
    770.15x = 466,057.71
  5. Step 5: Solve for x
    x = 466,057.71/770.15
  6. Step 6: Final answer
    x = 605.15

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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.