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Finding the Fourth Proportional to 776.31, 1,070.58 and 555.18

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Solution

The fourth proportional to 776.31, 1,070.58 and 555.18 is: 765.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.31 : 1,070.58 = 555.18 : x
  2. Step 2: Convert to fraction form
    776.31/1,070.58 = 555.18/x
  3. Step 3: Cross multiply
    776.31x = 1,070.58 × 555.18
  4. Step 4: Simplify right side
    776.31x = 594,364.60
  5. Step 5: Solve for x
    x = 594,364.60/776.31
  6. Step 6: Final answer
    x = 765.63

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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.