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Finding the Fourth Proportional to 1,509.48, 2,264.40 and 643.80

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Solution

The fourth proportional to 1,509.48, 2,264.40 and 643.80 is: 965.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,509.48 : 2,264.40 = 643.80 : x
  2. Step 2: Convert to fraction form
    1,509.48/2,264.40 = 643.80/x
  3. Step 3: Cross multiply
    1,509.48x = 2,264.40 × 643.80
  4. Step 4: Simplify right side
    1,509.48x = 1,457,820.72
  5. Step 5: Solve for x
    x = 1,457,820.72/1,509.48
  6. Step 6: Final answer
    x = 965.78

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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.