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Finding the Fourth Proportional to 1,059.12, 1,589.40 and 572.22

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Solution

The fourth proportional to 1,059.12, 1,589.40 and 572.22 is: 858.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,059.12 : 1,589.40 = 572.22 : x
  2. Step 2: Convert to fraction form
    1,059.12/1,589.40 = 572.22/x
  3. Step 3: Cross multiply
    1,059.12x = 1,589.40 × 572.22
  4. Step 4: Simplify right side
    1,059.12x = 909,486.47
  5. Step 5: Solve for x
    x = 909,486.47/1,059.12
  6. Step 6: Final answer
    x = 858.72

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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.