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Finding the Fourth Proportional to 972.95, 1,342.79 and 642.06

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Solution

The fourth proportional to 972.95, 1,342.79 and 642.06 is: 886.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.95 : 1,342.79 = 642.06 : x
  2. Step 2: Convert to fraction form
    972.95/1,342.79 = 642.06/x
  3. Step 3: Cross multiply
    972.95x = 1,342.79 × 642.06
  4. Step 4: Simplify right side
    972.95x = 862,148.54
  5. Step 5: Solve for x
    x = 862,148.54/972.95
  6. Step 6: Final answer
    x = 886.12

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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.