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Finding the Fourth Proportional to 878,136.60, 1,315,236.60 and 720,672.60

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Solution

The fourth proportional to 878,136.60, 1,315,236.60 and 720,672.60 is: 1,079,393.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    878,136.60 : 1,315,236.60 = 720,672.60 : x
  2. Step 2: Convert to fraction form
    878,136.60/1,315,236.60 = 720,672.60/x
  3. Step 3: Cross multiply
    878,136.60x = 1,315,236.60 × 720,672.60
  4. Step 4: Simplify right side
    878,136.60x = 947,854,980,137.16
  5. Step 5: Solve for x
    x = 947,854,980,137.16/878,136.60
  6. Step 6: Final answer
    x = 1,079,393.55

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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.