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Finding the Fourth Proportional to 972.94, 1,341.51 and 640.63

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Solution

The fourth proportional to 972.94, 1,341.51 and 640.63 is: 883.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.94 : 1,341.51 = 640.63 : x
  2. Step 2: Convert to fraction form
    972.94/1,341.51 = 640.63/x
  3. Step 3: Cross multiply
    972.94x = 1,341.51 × 640.63
  4. Step 4: Simplify right side
    972.94x = 859,411.55
  5. Step 5: Solve for x
    x = 859,411.55/972.94
  6. Step 6: Final answer
    x = 883.31

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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.