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Finding the Fourth Proportional to 709,980.54, 979,813.02 and 387,720.60

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Solution

The fourth proportional to 709,980.54, 979,813.02 and 387,720.60 is: 535,076.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,980.54 : 979,813.02 = 387,720.60 : x
  2. Step 2: Convert to fraction form
    709,980.54/979,813.02 = 387,720.60/x
  3. Step 3: Cross multiply
    709,980.54x = 979,813.02 × 387,720.60
  4. Step 4: Simplify right side
    709,980.54x = 379,893,692,002.21
  5. Step 5: Solve for x
    x = 379,893,692,002.21/709,980.54
  6. Step 6: Final answer
    x = 535,076.20

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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.