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Finding the Fourth Proportional to 1,355.71, 2,031.79 and 661.45

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Solution

The fourth proportional to 1,355.71, 2,031.79 and 661.45 is: 991.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,355.71 : 2,031.79 = 661.45 : x
  2. Step 2: Convert to fraction form
    1,355.71/2,031.79 = 661.45/x
  3. Step 3: Cross multiply
    1,355.71x = 2,031.79 × 661.45
  4. Step 4: Simplify right side
    1,355.71x = 1,343,927.50
  5. Step 5: Solve for x
    x = 1,343,927.50/1,355.71
  6. Step 6: Final answer
    x = 991.31

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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.