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Finding the Fourth Proportional to 1,565.51, 2,347.20 and 640.80

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Solution

The fourth proportional to 1,565.51, 2,347.20 and 640.80 is: 960.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,565.51 : 2,347.20 = 640.80 : x
  2. Step 2: Convert to fraction form
    1,565.51/2,347.20 = 640.80/x
  3. Step 3: Cross multiply
    1,565.51x = 2,347.20 × 640.80
  4. Step 4: Simplify right side
    1,565.51x = 1,504,085.76
  5. Step 5: Solve for x
    x = 1,504,085.76/1,565.51
  6. Step 6: Final answer
    x = 960.77

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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.