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Finding the Fourth Proportional to 979.84, 1,352.91 and 607.36

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Solution

The fourth proportional to 979.84, 1,352.91 and 607.36 is: 838.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.84 : 1,352.91 = 607.36 : x
  2. Step 2: Convert to fraction form
    979.84/1,352.91 = 607.36/x
  3. Step 3: Cross multiply
    979.84x = 1,352.91 × 607.36
  4. Step 4: Simplify right side
    979.84x = 821,703.42
  5. Step 5: Solve for x
    x = 821,703.42/979.84
  6. Step 6: Final answer
    x = 838.61

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Double scale
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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.