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Finding the Fourth Proportional to 1,140.55, 1,573.63 and 781.79

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Solution

The fourth proportional to 1,140.55, 1,573.63 and 781.79 is: 1,078.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.55 : 1,573.63 = 781.79 : x
  2. Step 2: Convert to fraction form
    1,140.55/1,573.63 = 781.79/x
  3. Step 3: Cross multiply
    1,140.55x = 1,573.63 × 781.79
  4. Step 4: Simplify right side
    1,140.55x = 1,230,238.38
  5. Step 5: Solve for x
    x = 1,230,238.38/1,140.55
  6. Step 6: Final answer
    x = 1,078.64

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1.5x scale

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.