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Finding the Fourth Proportional to 776.16, 1,070.31 and 708.72

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Solution

The fourth proportional to 776.16, 1,070.31 and 708.72 is: 977.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.16 : 1,070.31 = 708.72 : x
  2. Step 2: Convert to fraction form
    776.16/1,070.31 = 708.72/x
  3. Step 3: Cross multiply
    776.16x = 1,070.31 × 708.72
  4. Step 4: Simplify right side
    776.16x = 758,550.10
  5. Step 5: Solve for x
    x = 758,550.10/776.16
  6. Step 6: Final answer
    x = 977.31

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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.