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Finding the Fourth Proportional to 1,390,872.82, 1,919,275.41 and 787,260.82

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Solution

The fourth proportional to 1,390,872.82, 1,919,275.41 and 787,260.82 is: 1,086,346.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390,872.82 : 1,919,275.41 = 787,260.82 : x
  2. Step 2: Convert to fraction form
    1,390,872.82/1,919,275.41 = 787,260.82/x
  3. Step 3: Cross multiply
    1,390,872.82x = 1,919,275.41 × 787,260.82
  4. Step 4: Simplify right side
    1,390,872.82x = 1,510,970,333,082.44
  5. Step 5: Solve for x
    x = 1,510,970,333,082.44/1,390,872.82
  6. Step 6: Final answer
    x = 1,086,346.87

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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.