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Finding the Fourth Proportional to 257,373.78, 386,055.18 and 70,385.28

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Solution

The fourth proportional to 257,373.78, 386,055.18 and 70,385.28 is: 105,576.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,373.78 : 386,055.18 = 70,385.28 : x
  2. Step 2: Convert to fraction form
    257,373.78/386,055.18 = 70,385.28/x
  3. Step 3: Cross multiply
    257,373.78x = 386,055.18 × 70,385.28
  4. Step 4: Simplify right side
    257,373.78x = 27,172,601,939.75
  5. Step 5: Solve for x
    x = 27,172,601,939.75/257,373.78
  6. Step 6: Final answer
    x = 105,576.42

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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.