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Finding the Fourth Proportional to 770.94, 1,155.60 and 478.44

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Solution

The fourth proportional to 770.94, 1,155.60 and 478.44 is: 717.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.94 : 1,155.60 = 478.44 : x
  2. Step 2: Convert to fraction form
    770.94/1,155.60 = 478.44/x
  3. Step 3: Cross multiply
    770.94x = 1,155.60 × 478.44
  4. Step 4: Simplify right side
    770.94x = 552,885.26
  5. Step 5: Solve for x
    x = 552,885.26/770.94
  6. Step 6: Final answer
    x = 717.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.