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Finding the Fourth Proportional to 385,959.40, 578,939.10 and 136,666.60

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Solution

The fourth proportional to 385,959.40, 578,939.10 and 136,666.60 is: 204,999.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,959.40 : 578,939.10 = 136,666.60 : x
  2. Step 2: Convert to fraction form
    385,959.40/578,939.10 = 136,666.60/x
  3. Step 3: Cross multiply
    385,959.40x = 578,939.10 × 136,666.60
  4. Step 4: Simplify right side
    385,959.40x = 79,121,638,404.06
  5. Step 5: Solve for x
    x = 79,121,638,404.06/385,959.40
  6. Step 6: Final answer
    x = 204,999.90

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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.