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Finding the Fourth Proportional to 1,262.99, 1,742.51 and 765.45

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Solution

The fourth proportional to 1,262.99, 1,742.51 and 765.45 is: 1,056.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,262.99 : 1,742.51 = 765.45 : x
  2. Step 2: Convert to fraction form
    1,262.99/1,742.51 = 765.45/x
  3. Step 3: Cross multiply
    1,262.99x = 1,742.51 × 765.45
  4. Step 4: Simplify right side
    1,262.99x = 1,333,806.19
  5. Step 5: Solve for x
    x = 1,333,806.19/1,262.99
  6. Step 6: Final answer
    x = 1,056.07

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1.5x scale

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.