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Finding the Fourth Proportional to 90,867.20, 136,009.20 and 71,038.40

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Solution

The fourth proportional to 90,867.20, 136,009.20 and 71,038.40 is: 106,329.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,867.20 : 136,009.20 = 71,038.40 : x
  2. Step 2: Convert to fraction form
    90,867.20/136,009.20 = 71,038.40/x
  3. Step 3: Cross multiply
    90,867.20x = 136,009.20 × 71,038.40
  4. Step 4: Simplify right side
    90,867.20x = 9,661,875,953.28
  5. Step 5: Solve for x
    x = 9,661,875,953.28/90,867.20
  6. Step 6: Final answer
    x = 106,329.63

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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.