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Finding the Fourth Proportional to 287,775.36, 431,589.40 and 85,324.12

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Solution

The fourth proportional to 287,775.36, 431,589.40 and 85,324.12 is: 127,964.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,775.36 : 431,589.40 = 85,324.12 : x
  2. Step 2: Convert to fraction form
    287,775.36/431,589.40 = 85,324.12/x
  3. Step 3: Cross multiply
    287,775.36x = 431,589.40 × 85,324.12
  4. Step 4: Simplify right side
    287,775.36x = 36,824,985,756.33
  5. Step 5: Solve for x
    x = 36,824,985,756.33/287,775.36
  6. Step 6: Final answer
    x = 127,964.35

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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.