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Finding the Fourth Proportional to 72,670.80, 109,006.20 and 47,787.60

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Solution

The fourth proportional to 72,670.80, 109,006.20 and 47,787.60 is: 71,681.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,670.80 : 109,006.20 = 47,787.60 : x
  2. Step 2: Convert to fraction form
    72,670.80/109,006.20 = 47,787.60/x
  3. Step 3: Cross multiply
    72,670.80x = 109,006.20 × 47,787.60
  4. Step 4: Simplify right side
    72,670.80x = 5,209,144,683.12
  5. Step 5: Solve for x
    x = 5,209,144,683.12/72,670.80
  6. Step 6: Final answer
    x = 71,681.40

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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.