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Finding the Fourth Proportional to 1,405.74, 1,939.47 and 853.74

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Solution

The fourth proportional to 1,405.74, 1,939.47 and 853.74 is: 1,177.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.74 : 1,939.47 = 853.74 : x
  2. Step 2: Convert to fraction form
    1,405.74/1,939.47 = 853.74/x
  3. Step 3: Cross multiply
    1,405.74x = 1,939.47 × 853.74
  4. Step 4: Simplify right side
    1,405.74x = 1,655,803.12
  5. Step 5: Solve for x
    x = 1,655,803.12/1,405.74
  6. Step 6: Final answer
    x = 1,177.89

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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.