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Finding the Fourth Proportional to 1,421.69, 2,127.99 and 761.93

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Solution

The fourth proportional to 1,421.69, 2,127.99 and 761.93 is: 1,140.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.69 : 2,127.99 = 761.93 : x
  2. Step 2: Convert to fraction form
    1,421.69/2,127.99 = 761.93/x
  3. Step 3: Cross multiply
    1,421.69x = 2,127.99 × 761.93
  4. Step 4: Simplify right side
    1,421.69x = 1,621,368.78
  5. Step 5: Solve for x
    x = 1,621,368.78/1,421.69
  6. Step 6: Final answer
    x = 1,140.45

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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.