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Finding the Fourth Proportional to 775.59, 1,070.40 and 539.47

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Solution

The fourth proportional to 775.59, 1,070.40 and 539.47 is: 744.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.59 : 1,070.40 = 539.47 : x
  2. Step 2: Convert to fraction form
    775.59/1,070.40 = 539.47/x
  3. Step 3: Cross multiply
    775.59x = 1,070.40 × 539.47
  4. Step 4: Simplify right side
    775.59x = 577,448.69
  5. Step 5: Solve for x
    x = 577,448.69/775.59
  6. Step 6: Final answer
    x = 744.53

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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.