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Finding the Fourth Proportional to 135,312.38, 186,728.40 and 74,879.49

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Solution

The fourth proportional to 135,312.38, 186,728.40 and 74,879.49 is: 103,332.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,312.38 : 186,728.40 = 74,879.49 : x
  2. Step 2: Convert to fraction form
    135,312.38/186,728.40 = 74,879.49/x
  3. Step 3: Cross multiply
    135,312.38x = 186,728.40 × 74,879.49
  4. Step 4: Simplify right side
    135,312.38x = 13,982,127,360.52
  5. Step 5: Solve for x
    x = 13,982,127,360.52/135,312.38
  6. Step 6: Final answer
    x = 103,332.21

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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.