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Finding the Fourth Proportional to 287,588.40, 431,344.80 and 87,928.80

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Solution

The fourth proportional to 287,588.40, 431,344.80 and 87,928.80 is: 131,881.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,588.40 : 431,344.80 = 87,928.80 : x
  2. Step 2: Convert to fraction form
    287,588.40/431,344.80 = 87,928.80/x
  3. Step 3: Cross multiply
    287,588.40x = 431,344.80 × 87,928.80
  4. Step 4: Simplify right side
    287,588.40x = 37,927,630,650.24
  5. Step 5: Solve for x
    x = 37,927,630,650.24/287,588.40
  6. Step 6: Final answer
    x = 131,881.64

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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.