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Finding the Fourth Proportional to 135,391, 186,813.66 and 87,637.72

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Solution

The fourth proportional to 135,391, 186,813.66 and 87,637.72 is: 120,923.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,391 : 186,813.66 = 87,637.72 : x
  2. Step 2: Convert to fraction form
    135,391/186,813.66 = 87,637.72/x
  3. Step 3: Cross multiply
    135,391x = 186,813.66 × 87,637.72
  4. Step 4: Simplify right side
    135,391x = 16,371,923,227.26
  5. Step 5: Solve for x
    x = 16,371,923,227.26/135,391
  6. Step 6: Final answer
    x = 120,923.28

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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.