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Finding the Fourth Proportional to 770.18, 1,062.95 and 438.69

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Solution

The fourth proportional to 770.18, 1,062.95 and 438.69 is: 605.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.18 : 1,062.95 = 438.69 : x
  2. Step 2: Convert to fraction form
    770.18/1,062.95 = 438.69/x
  3. Step 3: Cross multiply
    770.18x = 1,062.95 × 438.69
  4. Step 4: Simplify right side
    770.18x = 466,303.34
  5. Step 5: Solve for x
    x = 466,303.34/770.18
  6. Step 6: Final answer
    x = 605.45

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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.