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Finding the Fourth Proportional to 1,420.30, 2,125.88 and 760.52

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Solution

The fourth proportional to 1,420.30, 2,125.88 and 760.52 is: 1,138.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.30 : 2,125.88 = 760.52 : x
  2. Step 2: Convert to fraction form
    1,420.30/2,125.88 = 760.52/x
  3. Step 3: Cross multiply
    1,420.30x = 2,125.88 × 760.52
  4. Step 4: Simplify right side
    1,420.30x = 1,616,774.26
  5. Step 5: Solve for x
    x = 1,616,774.26/1,420.30
  6. Step 6: Final answer
    x = 1,138.33

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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.