Home / 87,831.46-121,125.54-81,307.72

Finding the Fourth Proportional to 87,831.46, 121,125.54 and 81,307.72

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Solution

The fourth proportional to 87,831.46, 121,125.54 and 81,307.72 is: 112,128.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,831.46 : 121,125.54 = 81,307.72 : x
  2. Step 2: Convert to fraction form
    87,831.46/121,125.54 = 81,307.72/x
  3. Step 3: Cross multiply
    87,831.46x = 121,125.54 × 81,307.72
  4. Step 4: Simplify right side
    87,831.46x = 9,848,441,491.17
  5. Step 5: Solve for x
    x = 9,848,441,491.17/87,831.46
  6. Step 6: Final answer
    x = 112,128.86

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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.