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Finding the Fourth Proportional to 776.64, 1,070.56 and 689.28

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Solution

The fourth proportional to 776.64, 1,070.56 and 689.28 is: 950.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.64 : 1,070.56 = 689.28 : x
  2. Step 2: Convert to fraction form
    776.64/1,070.56 = 689.28/x
  3. Step 3: Cross multiply
    776.64x = 1,070.56 × 689.28
  4. Step 4: Simplify right side
    776.64x = 737,915.60
  5. Step 5: Solve for x
    x = 737,915.60/776.64
  6. Step 6: Final answer
    x = 950.14

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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.