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Finding the Fourth Proportional to 66,609.72, 91,831.86 and 64,545.84

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Solution

The fourth proportional to 66,609.72, 91,831.86 and 64,545.84 is: 88,986.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,609.72 : 91,831.86 = 64,545.84 : x
  2. Step 2: Convert to fraction form
    66,609.72/91,831.86 = 64,545.84/x
  3. Step 3: Cross multiply
    66,609.72x = 91,831.86 × 64,545.84
  4. Step 4: Simplify right side
    66,609.72x = 5,927,364,542.46
  5. Step 5: Solve for x
    x = 5,927,364,542.46/66,609.72
  6. Step 6: Final answer
    x = 88,986.48

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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.