Home / 287,579.10-431,364.60-129,807.30

Finding the Fourth Proportional to 287,579.10, 431,364.60 and 129,807.30

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Solution

The fourth proportional to 287,579.10, 431,364.60 and 129,807.30 is: 194,709.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,579.10 : 431,364.60 = 129,807.30 : x
  2. Step 2: Convert to fraction form
    287,579.10/431,364.60 = 129,807.30/x
  3. Step 3: Cross multiply
    287,579.10x = 431,364.60 × 129,807.30
  4. Step 4: Simplify right side
    287,579.10x = 55,994,274,041.58
  5. Step 5: Solve for x
    x = 55,994,274,041.58/287,579.10
  6. Step 6: Final answer
    x = 194,709.12

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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.