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Finding the Fourth Proportional to 1,140.90, 1,709.78 and 554.74

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Solution

The fourth proportional to 1,140.90, 1,709.78 and 554.74 is: 831.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.90 : 1,709.78 = 554.74 : x
  2. Step 2: Convert to fraction form
    1,140.90/1,709.78 = 554.74/x
  3. Step 3: Cross multiply
    1,140.90x = 1,709.78 × 554.74
  4. Step 4: Simplify right side
    1,140.90x = 948,478.59
  5. Step 5: Solve for x
    x = 948,478.59/1,140.90
  6. Step 6: Final answer
    x = 831.34

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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.