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Finding the Fourth Proportional to 10,128.70, 15,187.65 and 4,278.70

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Solution

The fourth proportional to 10,128.70, 15,187.65 and 4,278.70 is: 6,415.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,128.70 : 15,187.65 = 4,278.70 : x
  2. Step 2: Convert to fraction form
    10,128.70/15,187.65 = 4,278.70/x
  3. Step 3: Cross multiply
    10,128.70x = 15,187.65 × 4,278.70
  4. Step 4: Simplify right side
    10,128.70x = 64,983,398.06
  5. Step 5: Solve for x
    x = 64,983,398.06/10,128.70
  6. Step 6: Final answer
    x = 6,415.77

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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.