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Finding the Fourth Proportional to 1,129.63, 1,558.90 and 625.52

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Solution

The fourth proportional to 1,129.63, 1,558.90 and 625.52 is: 863.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.63 : 1,558.90 = 625.52 : x
  2. Step 2: Convert to fraction form
    1,129.63/1,558.90 = 625.52/x
  3. Step 3: Cross multiply
    1,129.63x = 1,558.90 × 625.52
  4. Step 4: Simplify right side
    1,129.63x = 975,123.13
  5. Step 5: Solve for x
    x = 975,123.13/1,129.63
  6. Step 6: Final answer
    x = 863.22

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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.