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Finding the Fourth Proportional to 390,453.24, 585,011.45 and 213,084.80

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Solution

The fourth proportional to 390,453.24, 585,011.45 and 213,084.80 is: 319,262.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,453.24 : 585,011.45 = 213,084.80 : x
  2. Step 2: Convert to fraction form
    390,453.24/585,011.45 = 213,084.80/x
  3. Step 3: Cross multiply
    390,453.24x = 585,011.45 × 213,084.80
  4. Step 4: Simplify right side
    390,453.24x = 124,657,043,830.48
  5. Step 5: Solve for x
    x = 124,657,043,830.48/390,453.24
  6. Step 6: Final answer
    x = 319,262.41

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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.