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Finding the Fourth Proportional to 427,578.90, 590,018.69 and 289,476.90

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Solution

The fourth proportional to 427,578.90, 590,018.69 and 289,476.90 is: 399,450.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,578.90 : 590,018.69 = 289,476.90 : x
  2. Step 2: Convert to fraction form
    427,578.90/590,018.69 = 289,476.90/x
  3. Step 3: Cross multiply
    427,578.90x = 590,018.69 × 289,476.90
  4. Step 4: Simplify right side
    427,578.90x = 170,796,778,373.17
  5. Step 5: Solve for x
    x = 170,796,778,373.17/427,578.90
  6. Step 6: Final answer
    x = 399,450.90

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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.