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Finding the Fourth Proportional to 280,516.40, 387,115.72 and 153,195.74

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Solution

The fourth proportional to 280,516.40, 387,115.72 and 153,195.74 is: 211,411.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,516.40 : 387,115.72 = 153,195.74 : x
  2. Step 2: Convert to fraction form
    280,516.40/387,115.72 = 153,195.74/x
  3. Step 3: Cross multiply
    280,516.40x = 387,115.72 × 153,195.74
  4. Step 4: Simplify right side
    280,516.40x = 59,304,479,191.03
  5. Step 5: Solve for x
    x = 59,304,479,191.03/280,516.40
  6. Step 6: Final answer
    x = 211,411.81

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1.5x scale

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.