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Finding the Fourth Proportional to 145,318.40, 217,831.80 and 66,489.20

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Solution

The fourth proportional to 145,318.40, 217,831.80 and 66,489.20 is: 99,667.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,318.40 : 217,831.80 = 66,489.20 : x
  2. Step 2: Convert to fraction form
    145,318.40/217,831.80 = 66,489.20/x
  3. Step 3: Cross multiply
    145,318.40x = 217,831.80 × 66,489.20
  4. Step 4: Simplify right side
    145,318.40x = 14,483,462,116.56
  5. Step 5: Solve for x
    x = 14,483,462,116.56/145,318.40
  6. Step 6: Final answer
    x = 99,667.09

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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.