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Finding the Fourth Proportional to 255,891.36, 353,130.69 and 142,721.40

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Solution

The fourth proportional to 255,891.36, 353,130.69 and 142,721.40 is: 196,955.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    255,891.36 : 353,130.69 = 142,721.40 : x
  2. Step 2: Convert to fraction form
    255,891.36/353,130.69 = 142,721.40/x
  3. Step 3: Cross multiply
    255,891.36x = 353,130.69 × 142,721.40
  4. Step 4: Simplify right side
    255,891.36x = 50,399,306,459.77
  5. Step 5: Solve for x
    x = 50,399,306,459.77/255,891.36
  6. Step 6: Final answer
    x = 196,955.87

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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.