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Finding the Fourth Proportional to 28,309, 39,068.04 and 15,737.80

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Solution

The fourth proportional to 28,309, 39,068.04 and 15,737.80 is: 21,719.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,309 : 39,068.04 = 15,737.80 : x
  2. Step 2: Convert to fraction form
    28,309/39,068.04 = 15,737.80/x
  3. Step 3: Cross multiply
    28,309x = 39,068.04 × 15,737.80
  4. Step 4: Simplify right side
    28,309x = 614,844,999.91
  5. Step 5: Solve for x
    x = 614,844,999.91/28,309
  6. Step 6: Final answer
    x = 21,719.06

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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.