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Finding the Fourth Proportional to 245,340.78, 368,011.14 and 79,128.78

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Solution

The fourth proportional to 245,340.78, 368,011.14 and 79,128.78 is: 118,693.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    245,340.78 : 368,011.14 = 79,128.78 : x
  2. Step 2: Convert to fraction form
    245,340.78/368,011.14 = 79,128.78/x
  3. Step 3: Cross multiply
    245,340.78x = 368,011.14 × 79,128.78
  4. Step 4: Simplify right side
    245,340.78x = 29,120,272,534.61
  5. Step 5: Solve for x
    x = 29,120,272,534.61/245,340.78
  6. Step 6: Final answer
    x = 118,693.16

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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.