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Finding the Fourth Proportional to 985.06, 1,358.98 and 653.67

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Solution

The fourth proportional to 985.06, 1,358.98 and 653.67 is: 901.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.06 : 1,358.98 = 653.67 : x
  2. Step 2: Convert to fraction form
    985.06/1,358.98 = 653.67/x
  3. Step 3: Cross multiply
    985.06x = 1,358.98 × 653.67
  4. Step 4: Simplify right side
    985.06x = 888,322.82
  5. Step 5: Solve for x
    x = 888,322.82/985.06
  6. Step 6: Final answer
    x = 901.79

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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.