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Finding the Fourth Proportional to 78,646.21, 117,987.95 and 34,280.89

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Solution

The fourth proportional to 78,646.21, 117,987.95 and 34,280.89 is: 51,429.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,646.21 : 117,987.95 = 34,280.89 : x
  2. Step 2: Convert to fraction form
    78,646.21/117,987.95 = 34,280.89/x
  3. Step 3: Cross multiply
    78,646.21x = 117,987.95 × 34,280.89
  4. Step 4: Simplify right side
    78,646.21x = 4,044,731,935.28
  5. Step 5: Solve for x
    x = 4,044,731,935.28/78,646.21
  6. Step 6: Final answer
    x = 51,429.46

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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.