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Finding the Fourth Proportional to 715.44, 985.02 and 623.40

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Solution

The fourth proportional to 715.44, 985.02 and 623.40 is: 858.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.44 : 985.02 = 623.40 : x
  2. Step 2: Convert to fraction form
    715.44/985.02 = 623.40/x
  3. Step 3: Cross multiply
    715.44x = 985.02 × 623.40
  4. Step 4: Simplify right side
    715.44x = 614,061.47
  5. Step 5: Solve for x
    x = 614,061.47/715.44
  6. Step 6: Final answer
    x = 858.30

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1.5x scale

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.