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Finding the Fourth Proportional to 1,309.90, 1,965.02 and 432.10

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Solution

The fourth proportional to 1,309.90, 1,965.02 and 432.10 is: 648.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.90 : 1,965.02 = 432.10 : x
  2. Step 2: Convert to fraction form
    1,309.90/1,965.02 = 432.10/x
  3. Step 3: Cross multiply
    1,309.90x = 1,965.02 × 432.10
  4. Step 4: Simplify right side
    1,309.90x = 849,085.14
  5. Step 5: Solve for x
    x = 849,085.14/1,309.90
  6. Step 6: Final answer
    x = 648.21

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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.