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Finding the Fourth Proportional to 78,779.78, 118,071.11 and 39,347.90

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Solution

The fourth proportional to 78,779.78, 118,071.11 and 39,347.90 is: 58,972.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,779.78 : 118,071.11 = 39,347.90 : x
  2. Step 2: Convert to fraction form
    78,779.78/118,071.11 = 39,347.90/x
  3. Step 3: Cross multiply
    78,779.78x = 118,071.11 × 39,347.90
  4. Step 4: Simplify right side
    78,779.78x = 4,645,849,638.81
  5. Step 5: Solve for x
    x = 4,645,849,638.81/78,779.78
  6. Step 6: Final answer
    x = 58,972.62

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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.