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Finding the Fourth Proportional to 145,036.80, 200,140.80 and 81,369.60

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Solution

The fourth proportional to 145,036.80, 200,140.80 and 81,369.60 is: 112,284.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,036.80 : 200,140.80 = 81,369.60 : x
  2. Step 2: Convert to fraction form
    145,036.80/200,140.80 = 81,369.60/x
  3. Step 3: Cross multiply
    145,036.80x = 200,140.80 × 81,369.60
  4. Step 4: Simplify right side
    145,036.80x = 16,285,376,839.68
  5. Step 5: Solve for x
    x = 16,285,376,839.68/145,036.80
  6. Step 6: Final answer
    x = 112,284.45

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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.