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Finding the Fourth Proportional to 391,501.20, 587,405.40 and 142,208.40

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Solution

The fourth proportional to 391,501.20, 587,405.40 and 142,208.40 is: 213,368.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,501.20 : 587,405.40 = 142,208.40 : x
  2. Step 2: Convert to fraction form
    391,501.20/587,405.40 = 142,208.40/x
  3. Step 3: Cross multiply
    391,501.20x = 587,405.40 × 142,208.40
  4. Step 4: Simplify right side
    391,501.20x = 83,533,982,085.36
  5. Step 5: Solve for x
    x = 83,533,982,085.36/391,501.20
  6. Step 6: Final answer
    x = 213,368.39

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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.