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Finding the Fourth Proportional to 81,353.32, 112,332.90 and 65,386.60

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Solution

The fourth proportional to 81,353.32, 112,332.90 and 65,386.60 is: 90,286.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,353.32 : 112,332.90 = 65,386.60 : x
  2. Step 2: Convert to fraction form
    81,353.32/112,332.90 = 65,386.60/x
  3. Step 3: Cross multiply
    81,353.32x = 112,332.90 × 65,386.60
  4. Step 4: Simplify right side
    81,353.32x = 7,345,066,399.14
  5. Step 5: Solve for x
    x = 7,345,066,399.14/81,353.32
  6. Step 6: Final answer
    x = 90,286.01

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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.