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Finding the Fourth Proportional to 78,685.20, 118,027.80 and 70,909.20

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Solution

The fourth proportional to 78,685.20, 118,027.80 and 70,909.20 is: 106,363.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,685.20 : 118,027.80 = 70,909.20 : x
  2. Step 2: Convert to fraction form
    78,685.20/118,027.80 = 70,909.20/x
  3. Step 3: Cross multiply
    78,685.20x = 118,027.80 × 70,909.20
  4. Step 4: Simplify right side
    78,685.20x = 8,369,256,875.76
  5. Step 5: Solve for x
    x = 8,369,256,875.76/78,685.20
  6. Step 6: Final answer
    x = 106,363.80

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1.5x scale

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.