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Finding the Fourth Proportional to 775.77, 1,070.19 and 609.99

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Solution

The fourth proportional to 775.77, 1,070.19 and 609.99 is: 841.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.77 : 1,070.19 = 609.99 : x
  2. Step 2: Convert to fraction form
    775.77/1,070.19 = 609.99/x
  3. Step 3: Cross multiply
    775.77x = 1,070.19 × 609.99
  4. Step 4: Simplify right side
    775.77x = 652,805.20
  5. Step 5: Solve for x
    x = 652,805.20/775.77
  6. Step 6: Final answer
    x = 841.49

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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.