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Finding the Fourth Proportional to 972.57, 1,341.21 and 640.66

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Solution

The fourth proportional to 972.57, 1,341.21 and 640.66 is: 883.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.57 : 1,341.21 = 640.66 : x
  2. Step 2: Convert to fraction form
    972.57/1,341.21 = 640.66/x
  3. Step 3: Cross multiply
    972.57x = 1,341.21 × 640.66
  4. Step 4: Simplify right side
    972.57x = 859,259.60
  5. Step 5: Solve for x
    x = 859,259.60/972.57
  6. Step 6: Final answer
    x = 883.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.