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Finding the Fourth Proportional to 775.55, 1,070.08 and 439.46

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Solution

The fourth proportional to 775.55, 1,070.08 and 439.46 is: 606.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.55 : 1,070.08 = 439.46 : x
  2. Step 2: Convert to fraction form
    775.55/1,070.08 = 439.46/x
  3. Step 3: Cross multiply
    775.55x = 1,070.08 × 439.46
  4. Step 4: Simplify right side
    775.55x = 470,258.93
  5. Step 5: Solve for x
    x = 470,258.93/775.55
  6. Step 6: Final answer
    x = 606.35

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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.