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Finding the Fourth Proportional to 15,802.80, 21,807.70 and 8,728.76

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Solution

The fourth proportional to 15,802.80, 21,807.70 and 8,728.76 is: 12,045.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,802.80 : 21,807.70 = 8,728.76 : x
  2. Step 2: Convert to fraction form
    15,802.80/21,807.70 = 8,728.76/x
  3. Step 3: Cross multiply
    15,802.80x = 21,807.70 × 8,728.76
  4. Step 4: Simplify right side
    15,802.80x = 190,354,179.45
  5. Step 5: Solve for x
    x = 190,354,179.45/15,802.80
  6. Step 6: Final answer
    x = 12,045.60

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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.