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Finding the Fourth Proportional to 287,571.10, 431,352.60 and 129,799.30

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Solution

The fourth proportional to 287,571.10, 431,352.60 and 129,799.30 is: 194,697.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,571.10 : 431,352.60 = 129,799.30 : x
  2. Step 2: Convert to fraction form
    287,571.10/431,352.60 = 129,799.30/x
  3. Step 3: Cross multiply
    287,571.10x = 431,352.60 × 129,799.30
  4. Step 4: Simplify right side
    287,571.10x = 55,989,265,533.18
  5. Step 5: Solve for x
    x = 55,989,265,533.18/287,571.10
  6. Step 6: Final answer
    x = 194,697.12

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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.