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Finding the Fourth Proportional to 779.92, 1,175.98 and 715.34

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Solution

The fourth proportional to 779.92, 1,175.98 and 715.34 is: 1,078.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.92 : 1,175.98 = 715.34 : x
  2. Step 2: Convert to fraction form
    779.92/1,175.98 = 715.34/x
  3. Step 3: Cross multiply
    779.92x = 1,175.98 × 715.34
  4. Step 4: Simplify right side
    779.92x = 841,225.53
  5. Step 5: Solve for x
    x = 841,225.53/779.92
  6. Step 6: Final answer
    x = 1,078.60

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.