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Finding the Fourth Proportional to 776.07, 1,070.91 and 477.45

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Solution

The fourth proportional to 776.07, 1,070.91 and 477.45 is: 658.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.07 : 1,070.91 = 477.45 : x
  2. Step 2: Convert to fraction form
    776.07/1,070.91 = 477.45/x
  3. Step 3: Cross multiply
    776.07x = 1,070.91 × 477.45
  4. Step 4: Simplify right side
    776.07x = 511,305.98
  5. Step 5: Solve for x
    x = 511,305.98/776.07
  6. Step 6: Final answer
    x = 658.84

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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.