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Finding the Fourth Proportional to 1,269.77, 1,904.61 and 345.47

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Solution

The fourth proportional to 1,269.77, 1,904.61 and 345.47 is: 518.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,269.77 : 1,904.61 = 345.47 : x
  2. Step 2: Convert to fraction form
    1,269.77/1,904.61 = 345.47/x
  3. Step 3: Cross multiply
    1,269.77x = 1,904.61 × 345.47
  4. Step 4: Simplify right side
    1,269.77x = 657,985.62
  5. Step 5: Solve for x
    x = 657,985.62/1,269.77
  6. Step 6: Final answer
    x = 518.19

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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.