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Finding the Fourth Proportional to 775.58, 1,070.28 and 480.92

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Solution

The fourth proportional to 775.58, 1,070.28 and 480.92 is: 663.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.58 : 1,070.28 = 480.92 : x
  2. Step 2: Convert to fraction form
    775.58/1,070.28 = 480.92/x
  3. Step 3: Cross multiply
    775.58x = 1,070.28 × 480.92
  4. Step 4: Simplify right side
    775.58x = 514,719.06
  5. Step 5: Solve for x
    x = 514,719.06/775.58
  6. Step 6: Final answer
    x = 663.66

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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.