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Finding the Fourth Proportional to 707.16, 977.34 and 620.76

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Solution

The fourth proportional to 707.16, 977.34 and 620.76 is: 857.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.16 : 977.34 = 620.76 : x
  2. Step 2: Convert to fraction form
    707.16/977.34 = 620.76/x
  3. Step 3: Cross multiply
    707.16x = 977.34 × 620.76
  4. Step 4: Simplify right side
    707.16x = 606,693.58
  5. Step 5: Solve for x
    x = 606,693.58/707.16
  6. Step 6: Final answer
    x = 857.93

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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.