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Finding the Fourth Proportional to 10,085.80, 15,128.70 and 8,992.30

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Solution

The fourth proportional to 10,085.80, 15,128.70 and 8,992.30 is: 13,488.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,085.80 : 15,128.70 = 8,992.30 : x
  2. Step 2: Convert to fraction form
    10,085.80/15,128.70 = 8,992.30/x
  3. Step 3: Cross multiply
    10,085.80x = 15,128.70 × 8,992.30
  4. Step 4: Simplify right side
    10,085.80x = 136,041,809.01
  5. Step 5: Solve for x
    x = 136,041,809.01/10,085.80
  6. Step 6: Final answer
    x = 13,488.45

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1.5x scale

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.