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Finding the Fourth Proportional to 757.58, 1,045.94 and 678.75

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Solution

The fourth proportional to 757.58, 1,045.94 and 678.75 is: 937.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.58 : 1,045.94 = 678.75 : x
  2. Step 2: Convert to fraction form
    757.58/1,045.94 = 678.75/x
  3. Step 3: Cross multiply
    757.58x = 1,045.94 × 678.75
  4. Step 4: Simplify right side
    757.58x = 709,936.71
  5. Step 5: Solve for x
    x = 709,936.71/757.58
  6. Step 6: Final answer
    x = 937.12

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1.5x scale

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.