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Finding the Fourth Proportional to 287,712.90, 431,569.35 and 252,720.90

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Solution

The fourth proportional to 287,712.90, 431,569.35 and 252,720.90 is: 379,081.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,712.90 : 431,569.35 = 252,720.90 : x
  2. Step 2: Convert to fraction form
    287,712.90/431,569.35 = 252,720.90/x
  3. Step 3: Cross multiply
    287,712.90x = 431,569.35 × 252,720.90
  4. Step 4: Simplify right side
    287,712.90x = 109,066,594,544.42
  5. Step 5: Solve for x
    x = 109,066,594,544.42/287,712.90
  6. Step 6: Final answer
    x = 379,081.35

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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.