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Finding the Fourth Proportional to 85,907.70, 128,809.78 and 38,514.23

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Solution

The fourth proportional to 85,907.70, 128,809.78 and 38,514.23 is: 57,748.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,907.70 : 128,809.78 = 38,514.23 : x
  2. Step 2: Convert to fraction form
    85,907.70/128,809.78 = 38,514.23/x
  3. Step 3: Cross multiply
    85,907.70x = 128,809.78 × 38,514.23
  4. Step 4: Simplify right side
    85,907.70x = 4,961,008,897.26
  5. Step 5: Solve for x
    x = 4,961,008,897.26/85,907.70
  6. Step 6: Final answer
    x = 57,748.13

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1.5x scale

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.