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Finding the Fourth Proportional to 85,831.86, 128,718.63 and 43,695.66

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Solution

The fourth proportional to 85,831.86, 128,718.63 and 43,695.66 is: 65,528.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,831.86 : 128,718.63 = 43,695.66 : x
  2. Step 2: Convert to fraction form
    85,831.86/128,718.63 = 43,695.66/x
  3. Step 3: Cross multiply
    85,831.86x = 128,718.63 × 43,695.66
  4. Step 4: Simplify right side
    85,831.86x = 5,624,445,492.15
  5. Step 5: Solve for x
    x = 5,624,445,492.15/85,831.86
  6. Step 6: Final answer
    x = 65,528.65

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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.