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Finding the Fourth Proportional to 156,831.05, 216,430.04 and 85,215.71

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Solution

The fourth proportional to 156,831.05, 216,430.04 and 85,215.71 is: 117,599.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,831.05 : 216,430.04 = 85,215.71 : x
  2. Step 2: Convert to fraction form
    156,831.05/216,430.04 = 85,215.71/x
  3. Step 3: Cross multiply
    156,831.05x = 216,430.04 × 85,215.71
  4. Step 4: Simplify right side
    156,831.05x = 18,443,240,278.04
  5. Step 5: Solve for x
    x = 18,443,240,278.04/156,831.05
  6. Step 6: Final answer
    x = 117,599.42

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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.