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Finding the Fourth Proportional to 1,235.40, 1,851.65 and 748.77

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Solution

The fourth proportional to 1,235.40, 1,851.65 and 748.77 is: 1,122.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,235.40 : 1,851.65 = 748.77 : x
  2. Step 2: Convert to fraction form
    1,235.40/1,851.65 = 748.77/x
  3. Step 3: Cross multiply
    1,235.40x = 1,851.65 × 748.77
  4. Step 4: Simplify right side
    1,235.40x = 1,386,459.97
  5. Step 5: Solve for x
    x = 1,386,459.97/1,235.40
  6. Step 6: Final answer
    x = 1,122.28

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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.