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Finding the Fourth Proportional to 1,780, 2,659.20 and 1,488.40

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Solution

The fourth proportional to 1,780, 2,659.20 and 1,488.40 is: 2,223.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,780 : 2,659.20 = 1,488.40 : x
  2. Step 2: Convert to fraction form
    1,780/2,659.20 = 1,488.40/x
  3. Step 3: Cross multiply
    1,780x = 2,659.20 × 1,488.40
  4. Step 4: Simplify right side
    1,780x = 3,957,953.28
  5. Step 5: Solve for x
    x = 3,957,953.28/1,780
  6. Step 6: Final answer
    x = 2,223.57

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.