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Finding the Fourth Proportional to 1,421,018, 1,961,879.68 and 912,616.64

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Solution

The fourth proportional to 1,421,018, 1,961,879.68 and 912,616.64 is: 1,259,972.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421,018 : 1,961,879.68 = 912,616.64 : x
  2. Step 2: Convert to fraction form
    1,421,018/1,961,879.68 = 912,616.64/x
  3. Step 3: Cross multiply
    1,421,018x = 1,961,879.68 × 912,616.64
  4. Step 4: Simplify right side
    1,421,018x = 1,790,444,041,645.88
  5. Step 5: Solve for x
    x = 1,790,444,041,645.88/1,421,018
  6. Step 6: Final answer
    x = 1,259,972.81

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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.