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Finding the Fourth Proportional to 972.86, 1,342.80 and 707.42

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Solution

The fourth proportional to 972.86, 1,342.80 and 707.42 is: 976.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.86 : 1,342.80 = 707.42 : x
  2. Step 2: Convert to fraction form
    972.86/1,342.80 = 707.42/x
  3. Step 3: Cross multiply
    972.86x = 1,342.80 × 707.42
  4. Step 4: Simplify right side
    972.86x = 949,923.58
  5. Step 5: Solve for x
    x = 949,923.58/972.86
  6. Step 6: Final answer
    x = 976.42

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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.