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Finding the Fourth Proportional to 857.15, 1,179.80 and 715.67

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Solution

The fourth proportional to 857.15, 1,179.80 and 715.67 is: 985.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.15 : 1,179.80 = 715.67 : x
  2. Step 2: Convert to fraction form
    857.15/1,179.80 = 715.67/x
  3. Step 3: Cross multiply
    857.15x = 1,179.80 × 715.67
  4. Step 4: Simplify right side
    857.15x = 844,337.99
  5. Step 5: Solve for x
    x = 844,337.99/857.15
  6. Step 6: Final answer
    x = 985.06

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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.