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Finding the Fourth Proportional to 391,477.20, 587,215.80 and 388,712.40

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Solution

The fourth proportional to 391,477.20, 587,215.80 and 388,712.40 is: 583,068.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,477.20 : 587,215.80 = 388,712.40 : x
  2. Step 2: Convert to fraction form
    391,477.20/587,215.80 = 388,712.40/x
  3. Step 3: Cross multiply
    391,477.20x = 587,215.80 × 388,712.40
  4. Step 4: Simplify right side
    391,477.20x = 228,258,062,935.92
  5. Step 5: Solve for x
    x = 228,258,062,935.92/391,477.20
  6. Step 6: Final answer
    x = 583,068.60

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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.