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Finding the Fourth Proportional to 775.68, 1,070.64 and 513.60

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Solution

The fourth proportional to 775.68, 1,070.64 and 513.60 is: 708.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.68 : 1,070.64 = 513.60 : x
  2. Step 2: Convert to fraction form
    775.68/1,070.64 = 513.60/x
  3. Step 3: Cross multiply
    775.68x = 1,070.64 × 513.60
  4. Step 4: Simplify right side
    775.68x = 549,880.70
  5. Step 5: Solve for x
    x = 549,880.70/775.68
  6. Step 6: Final answer
    x = 708.90

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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.