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Finding the Fourth Proportional to 1,140.86, 1,574.98 and 790.94

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Solution

The fourth proportional to 1,140.86, 1,574.98 and 790.94 is: 1,091.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.86 : 1,574.98 = 790.94 : x
  2. Step 2: Convert to fraction form
    1,140.86/1,574.98 = 790.94/x
  3. Step 3: Cross multiply
    1,140.86x = 1,574.98 × 790.94
  4. Step 4: Simplify right side
    1,140.86x = 1,245,714.68
  5. Step 5: Solve for x
    x = 1,245,714.68/1,140.86
  6. Step 6: Final answer
    x = 1,091.91

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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.