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Finding the Fourth Proportional to 145,320.70, 217,908.15 and 66,345.70

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Solution

The fourth proportional to 145,320.70, 217,908.15 and 66,345.70 is: 99,485.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,320.70 : 217,908.15 = 66,345.70 : x
  2. Step 2: Convert to fraction form
    145,320.70/217,908.15 = 66,345.70/x
  3. Step 3: Cross multiply
    145,320.70x = 217,908.15 × 66,345.70
  4. Step 4: Simplify right side
    145,320.70x = 14,457,268,747.46
  5. Step 5: Solve for x
    x = 14,457,268,747.46/145,320.70
  6. Step 6: Final answer
    x = 99,485.27

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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.