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Finding the Fourth Proportional to 707.40, 974.70 and 642.60

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Solution

The fourth proportional to 707.40, 974.70 and 642.60 is: 885.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.40 : 974.70 = 642.60 : x
  2. Step 2: Convert to fraction form
    707.40/974.70 = 642.60/x
  3. Step 3: Cross multiply
    707.40x = 974.70 × 642.60
  4. Step 4: Simplify right side
    707.40x = 626,342.22
  5. Step 5: Solve for x
    x = 626,342.22/707.40
  6. Step 6: Final answer
    x = 885.41

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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.