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Finding the Fourth Proportional to 1,354.40, 2,031.80 and 661.10

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Solution

The fourth proportional to 1,354.40, 2,031.80 and 661.10 is: 991.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,354.40 : 2,031.80 = 661.10 : x
  2. Step 2: Convert to fraction form
    1,354.40/2,031.80 = 661.10/x
  3. Step 3: Cross multiply
    1,354.40x = 2,031.80 × 661.10
  4. Step 4: Simplify right side
    1,354.40x = 1,343,222.98
  5. Step 5: Solve for x
    x = 1,343,222.98/1,354.40
  6. Step 6: Final answer
    x = 991.75

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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.