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Finding the Fourth Proportional to 907.68, 1,250.40 and 776.64

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Solution

The fourth proportional to 907.68, 1,250.40 and 776.64 is: 1,069.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.68 : 1,250.40 = 776.64 : x
  2. Step 2: Convert to fraction form
    907.68/1,250.40 = 776.64/x
  3. Step 3: Cross multiply
    907.68x = 1,250.40 × 776.64
  4. Step 4: Simplify right side
    907.68x = 971,110.66
  5. Step 5: Solve for x
    x = 971,110.66/907.68
  6. Step 6: Final answer
    x = 1,069.88

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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.