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Finding the Fourth Proportional to 1,312.91, 1,969.49 and 435.22

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Solution

The fourth proportional to 1,312.91, 1,969.49 and 435.22 is: 652.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.91 : 1,969.49 = 435.22 : x
  2. Step 2: Convert to fraction form
    1,312.91/1,969.49 = 435.22/x
  3. Step 3: Cross multiply
    1,312.91x = 1,969.49 × 435.22
  4. Step 4: Simplify right side
    1,312.91x = 857,167.46
  5. Step 5: Solve for x
    x = 857,167.46/1,312.91
  6. Step 6: Final answer
    x = 652.88

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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.