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Finding the Fourth Proportional to 1,265.76, 1,897.74 and 853.74

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Solution

The fourth proportional to 1,265.76, 1,897.74 and 853.74 is: 1,280.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,265.76 : 1,897.74 = 853.74 : x
  2. Step 2: Convert to fraction form
    1,265.76/1,897.74 = 853.74/x
  3. Step 3: Cross multiply
    1,265.76x = 1,897.74 × 853.74
  4. Step 4: Simplify right side
    1,265.76x = 1,620,176.55
  5. Step 5: Solve for x
    x = 1,620,176.55/1,265.76
  6. Step 6: Final answer
    x = 1,280.00

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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.