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Finding the Fourth Proportional to 775.02, 1,069.50 and 420.93

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Solution

The fourth proportional to 775.02, 1,069.50 and 420.93 is: 580.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.02 : 1,069.50 = 420.93 : x
  2. Step 2: Convert to fraction form
    775.02/1,069.50 = 420.93/x
  3. Step 3: Cross multiply
    775.02x = 1,069.50 × 420.93
  4. Step 4: Simplify right side
    775.02x = 450,180.34
  5. Step 5: Solve for x
    x = 450,180.34/775.02
  6. Step 6: Final answer
    x = 580.86

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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.