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Finding the Fourth Proportional to 1,140.40, 1,711.68 and 620.64

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Solution

The fourth proportional to 1,140.40, 1,711.68 and 620.64 is: 931.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.40 : 1,711.68 = 620.64 : x
  2. Step 2: Convert to fraction form
    1,140.40/1,711.68 = 620.64/x
  3. Step 3: Cross multiply
    1,140.40x = 1,711.68 × 620.64
  4. Step 4: Simplify right side
    1,140.40x = 1,062,337.08
  5. Step 5: Solve for x
    x = 1,062,337.08/1,140.40
  6. Step 6: Final answer
    x = 931.55

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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.