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Finding the Fourth Proportional to 687,398.77, 948,610.82 and 381,475.36

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Solution

The fourth proportional to 687,398.77, 948,610.82 and 381,475.36 is: 526,436.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,398.77 : 948,610.82 = 381,475.36 : x
  2. Step 2: Convert to fraction form
    687,398.77/948,610.82 = 381,475.36/x
  3. Step 3: Cross multiply
    687,398.77x = 948,610.82 × 381,475.36
  4. Step 4: Simplify right side
    687,398.77x = 361,871,647,408.96
  5. Step 5: Solve for x
    x = 361,871,647,408.96/687,398.77
  6. Step 6: Final answer
    x = 526,436.28

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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.