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Finding the Fourth Proportional to 152,699.78, 210,725.75 and 85,631.78

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Solution

The fourth proportional to 152,699.78, 210,725.75 and 85,631.78 is: 118,171.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    152,699.78 : 210,725.75 = 85,631.78 : x
  2. Step 2: Convert to fraction form
    152,699.78/210,725.75 = 85,631.78/x
  3. Step 3: Cross multiply
    152,699.78x = 210,725.75 × 85,631.78
  4. Step 4: Simplify right side
    152,699.78x = 18,044,821,064.34
  5. Step 5: Solve for x
    x = 18,044,821,064.34/152,699.78
  6. Step 6: Final answer
    x = 118,171.89

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1.5x scale

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.