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Finding the Fourth Proportional to 1,420.79, 2,130.94 and 543.07

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Solution

The fourth proportional to 1,420.79, 2,130.94 and 543.07 is: 814.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.79 : 2,130.94 = 543.07 : x
  2. Step 2: Convert to fraction form
    1,420.79/2,130.94 = 543.07/x
  3. Step 3: Cross multiply
    1,420.79x = 2,130.94 × 543.07
  4. Step 4: Simplify right side
    1,420.79x = 1,157,236.22
  5. Step 5: Solve for x
    x = 1,157,236.22/1,420.79
  6. Step 6: Final answer
    x = 814.50

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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.