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Finding the Fourth Proportional to 87,163.60, 130,831.80 and 42,840.40

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Solution

The fourth proportional to 87,163.60, 130,831.80 and 42,840.40 is: 64,303.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,163.60 : 130,831.80 = 42,840.40 : x
  2. Step 2: Convert to fraction form
    87,163.60/130,831.80 = 42,840.40/x
  3. Step 3: Cross multiply
    87,163.60x = 130,831.80 × 42,840.40
  4. Step 4: Simplify right side
    87,163.60x = 5,604,886,644.72
  5. Step 5: Solve for x
    x = 5,604,886,644.72/87,163.60
  6. Step 6: Final answer
    x = 64,303.07

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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.