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Finding the Fourth Proportional to 78,830.70, 118,246.05 and 72,869.10

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Solution

The fourth proportional to 78,830.70, 118,246.05 and 72,869.10 is: 109,303.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,830.70 : 118,246.05 = 72,869.10 : x
  2. Step 2: Convert to fraction form
    78,830.70/118,246.05 = 72,869.10/x
  3. Step 3: Cross multiply
    78,830.70x = 118,246.05 × 72,869.10
  4. Step 4: Simplify right side
    78,830.70x = 8,616,483,242.06
  5. Step 5: Solve for x
    x = 8,616,483,242.06/78,830.70
  6. Step 6: Final answer
    x = 109,303.65

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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.