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Finding the Fourth Proportional to 1,313.57, 1,970.55 and 765.47

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Solution

The fourth proportional to 1,313.57, 1,970.55 and 765.47 is: 1,148.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.57 : 1,970.55 = 765.47 : x
  2. Step 2: Convert to fraction form
    1,313.57/1,970.55 = 765.47/x
  3. Step 3: Cross multiply
    1,313.57x = 1,970.55 × 765.47
  4. Step 4: Simplify right side
    1,313.57x = 1,508,387.06
  5. Step 5: Solve for x
    x = 1,508,387.06/1,313.57
  6. Step 6: Final answer
    x = 1,148.32

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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.