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Finding the Fourth Proportional to 287,387.69, 431,081.54 and 87,709.13

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Solution

The fourth proportional to 287,387.69, 431,081.54 and 87,709.13 is: 131,563.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,387.69 : 431,081.54 = 87,709.13 : x
  2. Step 2: Convert to fraction form
    287,387.69/431,081.54 = 87,709.13/x
  3. Step 3: Cross multiply
    287,387.69x = 431,081.54 × 87,709.13
  4. Step 4: Simplify right side
    287,387.69x = 37,809,784,238.51
  5. Step 5: Solve for x
    x = 37,809,784,238.51/287,387.69
  6. Step 6: Final answer
    x = 131,563.69

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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.