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Finding the Fourth Proportional to 391,495.20, 587,242.80 and 388,730.40

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Solution

The fourth proportional to 391,495.20, 587,242.80 and 388,730.40 is: 583,095.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,495.20 : 587,242.80 = 388,730.40 : x
  2. Step 2: Convert to fraction form
    391,495.20/587,242.80 = 388,730.40/x
  3. Step 3: Cross multiply
    391,495.20x = 587,242.80 × 388,730.40
  4. Step 4: Simplify right side
    391,495.20x = 228,279,128,541.12
  5. Step 5: Solve for x
    x = 228,279,128,541.12/391,495.20
  6. Step 6: Final answer
    x = 583,095.60

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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.