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Finding the Fourth Proportional to 287,439.70, 431,159.55 and 265,788.40

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Solution

The fourth proportional to 287,439.70, 431,159.55 and 265,788.40 is: 398,682.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,439.70 : 431,159.55 = 265,788.40 : x
  2. Step 2: Convert to fraction form
    287,439.70/431,159.55 = 265,788.40/x
  3. Step 3: Cross multiply
    287,439.70x = 431,159.55 × 265,788.40
  4. Step 4: Simplify right side
    287,439.70x = 114,597,206,939.22
  5. Step 5: Solve for x
    x = 114,597,206,939.22/287,439.70
  6. Step 6: Final answer
    x = 398,682.60

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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.