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Finding the Fourth Proportional to 776.08, 1,070.76 and 702.16

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Solution

The fourth proportional to 776.08, 1,070.76 and 702.16 is: 968.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.08 : 1,070.76 = 702.16 : x
  2. Step 2: Convert to fraction form
    776.08/1,070.76 = 702.16/x
  3. Step 3: Cross multiply
    776.08x = 1,070.76 × 702.16
  4. Step 4: Simplify right side
    776.08x = 751,844.84
  5. Step 5: Solve for x
    x = 751,844.84/776.08
  6. Step 6: Final answer
    x = 968.77

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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.