Home / 1,089.02-1,634.20-430.78

Finding the Fourth Proportional to 1,089.02, 1,634.20 and 430.78

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Solution

The fourth proportional to 1,089.02, 1,634.20 and 430.78 is: 646.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.02 : 1,634.20 = 430.78 : x
  2. Step 2: Convert to fraction form
    1,089.02/1,634.20 = 430.78/x
  3. Step 3: Cross multiply
    1,089.02x = 1,634.20 × 430.78
  4. Step 4: Simplify right side
    1,089.02x = 703,987.26
  5. Step 5: Solve for x
    x = 703,987.26/1,089.02
  6. Step 6: Final answer
    x = 646.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.