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Finding the Fourth Proportional to 145,378.93, 217,926.03 and 81,368.34

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Solution

The fourth proportional to 145,378.93, 217,926.03 and 81,368.34 is: 121,972.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,378.93 : 217,926.03 = 81,368.34 : x
  2. Step 2: Convert to fraction form
    145,378.93/217,926.03 = 81,368.34/x
  3. Step 3: Cross multiply
    145,378.93x = 217,926.03 × 81,368.34
  4. Step 4: Simplify right side
    145,378.93x = 17,732,279,303.89
  5. Step 5: Solve for x
    x = 17,732,279,303.89/145,378.93
  6. Step 6: Final answer
    x = 121,972.83

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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.