Home / 1,279.10-1,918.65-841.70

Finding the Fourth Proportional to 1,279.10, 1,918.65 and 841.70

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Solution

The fourth proportional to 1,279.10, 1,918.65 and 841.70 is: 1,262.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.10 : 1,918.65 = 841.70 : x
  2. Step 2: Convert to fraction form
    1,279.10/1,918.65 = 841.70/x
  3. Step 3: Cross multiply
    1,279.10x = 1,918.65 × 841.70
  4. Step 4: Simplify right side
    1,279.10x = 1,614,927.71
  5. Step 5: Solve for x
    x = 1,614,927.71/1,279.10
  6. Step 6: Final answer
    x = 1,262.55

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1.5x scale

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.