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Finding the Fourth Proportional to 529,690.91, 730,987.88 and 287,989.75

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Solution

The fourth proportional to 529,690.91, 730,987.88 and 287,989.75 is: 397,433.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    529,690.91 : 730,987.88 = 287,989.75 : x
  2. Step 2: Convert to fraction form
    529,690.91/730,987.88 = 287,989.75/x
  3. Step 3: Cross multiply
    529,690.91x = 730,987.88 × 287,989.75
  4. Step 4: Simplify right side
    529,690.91x = 210,517,011,719.34
  5. Step 5: Solve for x
    x = 210,517,011,719.34/529,690.91
  6. Step 6: Final answer
    x = 397,433.69

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.