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Finding the Fourth Proportional to 74,987.78, 112,458.94 and 39,429.93

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Solution

The fourth proportional to 74,987.78, 112,458.94 and 39,429.93 is: 59,132.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,987.78 : 112,458.94 = 39,429.93 : x
  2. Step 2: Convert to fraction form
    74,987.78/112,458.94 = 39,429.93/x
  3. Step 3: Cross multiply
    74,987.78x = 112,458.94 × 39,429.93
  4. Step 4: Simplify right side
    74,987.78x = 4,434,248,132.07
  5. Step 5: Solve for x
    x = 4,434,248,132.07/74,987.78
  6. Step 6: Final answer
    x = 59,132.94

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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.