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Finding the Fourth Proportional to 78,856.80, 118,285.20 and 56,623.20

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Solution

The fourth proportional to 78,856.80, 118,285.20 and 56,623.20 is: 84,934.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,856.80 : 118,285.20 = 56,623.20 : x
  2. Step 2: Convert to fraction form
    78,856.80/118,285.20 = 56,623.20/x
  3. Step 3: Cross multiply
    78,856.80x = 118,285.20 × 56,623.20
  4. Step 4: Simplify right side
    78,856.80x = 6,697,686,536.64
  5. Step 5: Solve for x
    x = 6,697,686,536.64/78,856.80
  6. Step 6: Final answer
    x = 84,934.80

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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.