Home / 287,619.20-431,428.80-188,086.40

Finding the Fourth Proportional to 287,619.20, 431,428.80 and 188,086.40

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Solution

The fourth proportional to 287,619.20, 431,428.80 and 188,086.40 is: 282,129.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,619.20 : 431,428.80 = 188,086.40 : x
  2. Step 2: Convert to fraction form
    287,619.20/431,428.80 = 188,086.40/x
  3. Step 3: Cross multiply
    287,619.20x = 431,428.80 × 188,086.40
  4. Step 4: Simplify right side
    287,619.20x = 81,145,889,848.32
  5. Step 5: Solve for x
    x = 81,145,889,848.32/287,619.20
  6. Step 6: Final answer
    x = 282,129.60

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1.5x scale

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.