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Finding the Fourth Proportional to 715.08, 985.70 and 685.92

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Solution

The fourth proportional to 715.08, 985.70 and 685.92 is: 945.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.08 : 985.70 = 685.92 : x
  2. Step 2: Convert to fraction form
    715.08/985.70 = 685.92/x
  3. Step 3: Cross multiply
    715.08x = 985.70 × 685.92
  4. Step 4: Simplify right side
    715.08x = 676,111.34
  5. Step 5: Solve for x
    x = 676,111.34/715.08
  6. Step 6: Final answer
    x = 945.50

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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.