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Finding the Fourth Proportional to 885,709.72, 1,328,639.22 and 278,637.40

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Solution

The fourth proportional to 885,709.72, 1,328,639.22 and 278,637.40 is: 417,979.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    885,709.72 : 1,328,639.22 = 278,637.40 : x
  2. Step 2: Convert to fraction form
    885,709.72/1,328,639.22 = 278,637.40/x
  3. Step 3: Cross multiply
    885,709.72x = 1,328,639.22 × 278,637.40
  4. Step 4: Simplify right side
    885,709.72x = 370,208,577,798.83
  5. Step 5: Solve for x
    x = 370,208,577,798.83/885,709.72
  6. Step 6: Final answer
    x = 417,979.58

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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.