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Finding the Fourth Proportional to 8,720.40, 12,032.76 and 5,737.44

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Solution

The fourth proportional to 8,720.40, 12,032.76 and 5,737.44 is: 7,916.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,720.40 : 12,032.76 = 5,737.44 : x
  2. Step 2: Convert to fraction form
    8,720.40/12,032.76 = 5,737.44/x
  3. Step 3: Cross multiply
    8,720.40x = 12,032.76 × 5,737.44
  4. Step 4: Simplify right side
    8,720.40x = 69,037,238.53
  5. Step 5: Solve for x
    x = 69,037,238.53/8,720.40
  6. Step 6: Final answer
    x = 7,916.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.