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Finding the Fourth Proportional to 153,871.65, 212,088.67 and 102,865.75

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Solution

The fourth proportional to 153,871.65, 212,088.67 and 102,865.75 is: 141,784.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,871.65 : 212,088.67 = 102,865.75 : x
  2. Step 2: Convert to fraction form
    153,871.65/212,088.67 = 102,865.75/x
  3. Step 3: Cross multiply
    153,871.65x = 212,088.67 × 102,865.75
  4. Step 4: Simplify right side
    153,871.65x = 21,816,659,045.61
  5. Step 5: Solve for x
    x = 21,816,659,045.61/153,871.65
  6. Step 6: Final answer
    x = 141,784.79

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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.