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Finding the Fourth Proportional to 715.94, 985.71 and 623.90

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Solution

The fourth proportional to 715.94, 985.71 and 623.90 is: 858.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.94 : 985.71 = 623.90 : x
  2. Step 2: Convert to fraction form
    715.94/985.71 = 623.90/x
  3. Step 3: Cross multiply
    715.94x = 985.71 × 623.90
  4. Step 4: Simplify right side
    715.94x = 614,984.47
  5. Step 5: Solve for x
    x = 614,984.47/715.94
  6. Step 6: Final answer
    x = 858.99

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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.