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Finding the Fourth Proportional to 1,129.14, 1,556.69 and 930.15

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Solution

The fourth proportional to 1,129.14, 1,556.69 and 930.15 is: 1,282.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.14 : 1,556.69 = 930.15 : x
  2. Step 2: Convert to fraction form
    1,129.14/1,556.69 = 930.15/x
  3. Step 3: Cross multiply
    1,129.14x = 1,556.69 × 930.15
  4. Step 4: Simplify right side
    1,129.14x = 1,447,950.55
  5. Step 5: Solve for x
    x = 1,447,950.55/1,129.14
  6. Step 6: Final answer
    x = 1,282.35

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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.