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Finding the Fourth Proportional to 72,831.39, 100,515.53 and 64,700.78

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Solution

The fourth proportional to 72,831.39, 100,515.53 and 64,700.78 is: 89,294.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,831.39 : 100,515.53 = 64,700.78 : x
  2. Step 2: Convert to fraction form
    72,831.39/100,515.53 = 64,700.78/x
  3. Step 3: Cross multiply
    72,831.39x = 100,515.53 × 64,700.78
  4. Step 4: Simplify right side
    72,831.39x = 6,503,432,852.29
  5. Step 5: Solve for x
    x = 6,503,432,852.29/72,831.39
  6. Step 6: Final answer
    x = 89,294.37

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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.