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Finding the Fourth Proportional to 78,630.90, 117,946.35 and 61,113.30

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Solution

The fourth proportional to 78,630.90, 117,946.35 and 61,113.30 is: 91,669.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,630.90 : 117,946.35 = 61,113.30 : x
  2. Step 2: Convert to fraction form
    78,630.90/117,946.35 = 61,113.30/x
  3. Step 3: Cross multiply
    78,630.90x = 117,946.35 × 61,113.30
  4. Step 4: Simplify right side
    78,630.90x = 7,208,090,671.46
  5. Step 5: Solve for x
    x = 7,208,090,671.46/78,630.90
  6. Step 6: Final answer
    x = 91,669.95

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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.