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Finding the Fourth Proportional to 1,420.79, 2,127.81 and 688.01

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Solution

The fourth proportional to 1,420.79, 2,127.81 and 688.01 is: 1,030.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.79 : 2,127.81 = 688.01 : x
  2. Step 2: Convert to fraction form
    1,420.79/2,127.81 = 688.01/x
  3. Step 3: Cross multiply
    1,420.79x = 2,127.81 × 688.01
  4. Step 4: Simplify right side
    1,420.79x = 1,463,954.56
  5. Step 5: Solve for x
    x = 1,463,954.56/1,420.79
  6. Step 6: Final answer
    x = 1,030.38

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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.