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Finding the Fourth Proportional to 707.92, 977.80 and 568.90

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Solution

The fourth proportional to 707.92, 977.80 and 568.90 is: 785.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.92 : 977.80 = 568.90 : x
  2. Step 2: Convert to fraction form
    707.92/977.80 = 568.90/x
  3. Step 3: Cross multiply
    707.92x = 977.80 × 568.90
  4. Step 4: Simplify right side
    707.92x = 556,270.42
  5. Step 5: Solve for x
    x = 556,270.42/707.92
  6. Step 6: Final answer
    x = 785.78

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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.