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Finding the Fourth Proportional to 1,039.34, 1,559.20 and 577.64

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Solution

The fourth proportional to 1,039.34, 1,559.20 and 577.64 is: 866.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.34 : 1,559.20 = 577.64 : x
  2. Step 2: Convert to fraction form
    1,039.34/1,559.20 = 577.64/x
  3. Step 3: Cross multiply
    1,039.34x = 1,559.20 × 577.64
  4. Step 4: Simplify right side
    1,039.34x = 900,656.29
  5. Step 5: Solve for x
    x = 900,656.29/1,039.34
  6. Step 6: Final answer
    x = 866.57

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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.