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Finding the Fourth Proportional to 1,010.80, 1,395.70 and 790.38

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Solution

The fourth proportional to 1,010.80, 1,395.70 and 790.38 is: 1,091.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,010.80 : 1,395.70 = 790.38 : x
  2. Step 2: Convert to fraction form
    1,010.80/1,395.70 = 790.38/x
  3. Step 3: Cross multiply
    1,010.80x = 1,395.70 × 790.38
  4. Step 4: Simplify right side
    1,010.80x = 1,103,131.39
  5. Step 5: Solve for x
    x = 1,103,131.39/1,010.80
  6. Step 6: Final answer
    x = 1,091.34

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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.