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Finding the Fourth Proportional to 1,420.92, 2,130.62 and 651

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Solution

The fourth proportional to 1,420.92, 2,130.62 and 651 is: 976.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.92 : 2,130.62 = 651 : x
  2. Step 2: Convert to fraction form
    1,420.92/2,130.62 = 651/x
  3. Step 3: Cross multiply
    1,420.92x = 2,130.62 × 651
  4. Step 4: Simplify right side
    1,420.92x = 1,387,033.62
  5. Step 5: Solve for x
    x = 1,387,033.62/1,420.92
  6. Step 6: Final answer
    x = 976.15

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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.