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Finding the Fourth Proportional to 145,309.40, 217,964.10 and 127,813.40

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Solution

The fourth proportional to 145,309.40, 217,964.10 and 127,813.40 is: 191,720.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,309.40 : 217,964.10 = 127,813.40 : x
  2. Step 2: Convert to fraction form
    145,309.40/217,964.10 = 127,813.40/x
  3. Step 3: Cross multiply
    145,309.40x = 217,964.10 × 127,813.40
  4. Step 4: Simplify right side
    145,309.40x = 27,858,732,698.94
  5. Step 5: Solve for x
    x = 27,858,732,698.94/145,309.40
  6. Step 6: Final answer
    x = 191,720.10

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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.