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Finding the Fourth Proportional to 761.95, 1,051.60 and 715.04

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Solution

The fourth proportional to 761.95, 1,051.60 and 715.04 is: 986.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.95 : 1,051.60 = 715.04 : x
  2. Step 2: Convert to fraction form
    761.95/1,051.60 = 715.04/x
  3. Step 3: Cross multiply
    761.95x = 1,051.60 × 715.04
  4. Step 4: Simplify right side
    761.95x = 751,936.06
  5. Step 5: Solve for x
    x = 751,936.06/761.95
  6. Step 6: Final answer
    x = 986.86

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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.