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Finding the Fourth Proportional to 1,290.13, 1,780.31 and 766.13

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Solution

The fourth proportional to 1,290.13, 1,780.31 and 766.13 is: 1,057.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.13 : 1,780.31 = 766.13 : x
  2. Step 2: Convert to fraction form
    1,290.13/1,780.31 = 766.13/x
  3. Step 3: Cross multiply
    1,290.13x = 1,780.31 × 766.13
  4. Step 4: Simplify right side
    1,290.13x = 1,363,941.91
  5. Step 5: Solve for x
    x = 1,363,941.91/1,290.13
  6. Step 6: Final answer
    x = 1,057.21

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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.